1 00:00:19,185 --> 00:00:23,725 -Three, two, one. Action! 2 00:00:23,940 --> 00:00:25,070 CHRIS: Since I was playing Thor... 3 00:00:26,484 --> 00:00:28,784 ...I've definitely ate a lot more food than I used to. 4 00:00:30,238 --> 00:00:31,488 Each meal is about 1000 calories. 5 00:00:31,698 --> 00:00:33,068 Ice cream. 6 00:00:34,409 --> 00:00:35,579 Big juicy steaks. 7 00:00:35,744 --> 00:00:37,124 Goes straight in there. 8 00:00:37,287 --> 00:00:40,917 Burgers, pad Thai, pasta, ribs. 9 00:00:41,291 --> 00:00:47,051 Sausage rolls, pizza, cake, donuts, hot dogs. 10 00:00:47,672 --> 00:00:50,342 When it comes to food, I'm like a starving hound. 11 00:00:53,219 --> 00:00:54,509 Only less picky. 12 00:00:56,056 --> 00:00:58,886 I mean, I do know that what I put into my body is important, 13 00:00:59,017 --> 00:01:02,097 but what I didn't know is that the best thing I can eat 14 00:01:02,270 --> 00:01:06,110 if I wanna live a long and healthy life is nothing. 15 00:01:06,941 --> 00:01:08,111 Absolutely nothing. 16 00:01:14,282 --> 00:01:16,492 Well, at least that's what this guy says. 17 00:01:17,619 --> 00:01:20,369 Longevity expert, Dr. Peter Attia. 18 00:01:22,415 --> 00:01:23,415 Thank you very much. 19 00:01:23,500 --> 00:01:25,460 -We'll make this our last supper. -Our last supper. 20 00:01:28,505 --> 00:01:32,005 For the next step in my quest to live longer and better, 21 00:01:32,425 --> 00:01:36,545 he wants me to go on a fast. It's basically water 22 00:01:36,638 --> 00:01:41,018 and zero calories for four days. 23 00:01:42,769 --> 00:01:45,189 Thank you... very much. 24 00:01:45,563 --> 00:01:46,823 Thank you. 25 00:01:47,607 --> 00:01:50,027 -Right. 26 00:01:52,862 --> 00:01:56,452 Yeah, good thing I got to kick it off with a hearty last supper. 27 00:01:56,699 --> 00:01:58,789 Six shreds of lettuce and a carrot. 28 00:02:00,620 --> 00:02:02,250 -Hmm. -Look, I'm gonna do it with you. 29 00:02:02,413 --> 00:02:03,503 -You are? -And... Yeah. 30 00:02:03,623 --> 00:02:05,793 It makes it a lot easier to go through this with somebody else. 31 00:02:05,917 --> 00:02:07,037 -So... -Okay, good. 32 00:02:07,127 --> 00:02:08,457 -Good, we'll suffer together. -Yeah. 33 00:02:08,628 --> 00:02:10,508 -We will. 34 00:02:11,005 --> 00:02:13,165 I've definitely gone a day without food before. 35 00:02:14,884 --> 00:02:18,434 I think I get pretty cranky when... ...I've missed a meal. 36 00:02:20,431 --> 00:02:23,691 Certainly, detrimental to my happiness. 37 00:02:23,977 --> 00:02:27,307 So, it's a pretty long time, why four days? Why not... 38 00:02:27,730 --> 00:02:29,440 -Why not longer? 39 00:02:29,566 --> 00:02:32,436 I mean, what is the benefit with four days? Why that number? 40 00:02:32,610 --> 00:02:37,490 Three to four days is probably that window at which we do enough 41 00:02:37,574 --> 00:02:41,744 to change how your body is interacting 42 00:02:41,828 --> 00:02:45,748 with the absence of nutrients to basically do kind of a reboot 43 00:02:45,874 --> 00:02:47,384 -on your system. -Oh, really? 44 00:02:47,792 --> 00:02:49,462 You think I'm gonna be able to hold it together? 45 00:02:49,544 --> 00:02:52,344 You reckon, in your experience, you see a lot of people, 46 00:02:52,547 --> 00:02:54,337 the first time they do it, succeed? 47 00:02:54,632 --> 00:02:56,842 In the next four days, there is no doubt in my mind, 48 00:02:56,968 --> 00:03:01,508 there will be a period of time in which you feel sluggish or... 49 00:03:01,681 --> 00:03:03,061 -Tears? -Yeah. 50 00:03:03,266 --> 00:03:05,806 -Emotional. -Kinda grumpy, grouchy, whatever. 51 00:03:06,853 --> 00:03:08,693 But, you know, if you really stop to think about it, 52 00:03:08,813 --> 00:03:11,073 this idea that we kind of live today 53 00:03:11,149 --> 00:03:14,279 where we're sort of surrounded by unlimited access to food 54 00:03:14,360 --> 00:03:17,740 and we can eat three meals and snack in between them, 55 00:03:17,906 --> 00:03:21,576 that's a relatively recent addition to our species. 56 00:03:21,701 --> 00:03:24,661 -Right. -And our ancestors would've gone days 57 00:03:24,746 --> 00:03:26,246 without food all the time, 58 00:03:26,331 --> 00:03:29,501 and not only did they have to do that, they had the ability to, 59 00:03:29,709 --> 00:03:32,249 in a period of starvation, actually go out and hunt. 60 00:03:35,632 --> 00:03:40,352 Right. I'm done. I have nothing left, except for one tiny little carrot. 61 00:03:42,388 --> 00:03:44,388 You gonna finish that last piece left of lettuce? 62 00:03:44,515 --> 00:03:46,425 Though, what about dessert? We get dessert or not? 63 00:03:46,768 --> 00:03:48,098 -No. 64 00:03:49,103 --> 00:03:53,193 Starting to think, this could be the most difficult four days of my life. 65 00:03:57,570 --> 00:04:00,450 In truth, I think Chris will find this hard. 66 00:04:01,282 --> 00:04:05,122 But I've been practicing periodic fasting for many years, and in doing so, 67 00:04:05,203 --> 00:04:07,713 I've realized that the key is staying busy. 68 00:04:08,665 --> 00:04:10,745 So I've thought of an entirely appropriate challenge 69 00:04:10,875 --> 00:04:15,835 to help distract Chris from his hunger. I want him to do what his ancestors did. 70 00:04:16,381 --> 00:04:17,971 I want him to hunt for his next meal. 71 00:04:19,259 --> 00:04:23,219 But not on land. Instead, in the ocean. 72 00:04:29,769 --> 00:04:32,859 So, the plan is, that after four days without food... 73 00:04:35,400 --> 00:04:37,360 we're gonna head for the Great Barrier Reef. 74 00:04:43,074 --> 00:04:44,994 I'm gonna be armed with a lungful of air... 75 00:04:51,874 --> 00:04:53,004 and a speargun... 76 00:04:54,085 --> 00:04:56,835 I'm gonna try and dive 30 feet to the ocean floor... 77 00:04:58,423 --> 00:04:59,423 in search of a fish. 78 00:05:01,718 --> 00:05:02,928 So, there's no pressure at all. 79 00:05:10,560 --> 00:05:11,640 Thanks a lot, Pete. 80 00:05:21,654 --> 00:05:22,914 This is day one of the fast. 81 00:05:24,324 --> 00:05:27,744 I had a good sleep, I had probably seven... seven hours. 82 00:05:28,161 --> 00:05:29,251 I did dream about fasting, 83 00:05:29,329 --> 00:05:31,499 which was weird 'cause I wasn't in a fasted state. 84 00:05:31,956 --> 00:05:34,246 Fed the kids bacon and eggs this morning, that was a little tempting, 85 00:05:34,417 --> 00:05:39,087 but it's early days and I don't feel a huge threat 86 00:05:39,255 --> 00:05:42,045 at this point of breaking my four-day fast. 87 00:05:42,592 --> 00:05:44,592 I'm gonna get rid of the dog though, just in case he does... 88 00:05:44,677 --> 00:05:46,597 -...eat it. 89 00:05:46,679 --> 00:05:48,929 The dog will start to look like a roast chicken or something, right? 90 00:05:50,266 --> 00:05:53,726 Yeah, yeah. No, we wouldn't eat her, unless we really had to. 91 00:05:54,437 --> 00:05:57,977 At first, Chris will feel fine. He'll be working off the energy 92 00:05:58,066 --> 00:06:03,646 from his last meal. But once that's gone, he's gonna start to feel a lot worse. 93 00:06:04,197 --> 00:06:05,987 But I'm gonna want him to stick with this, 94 00:06:06,491 --> 00:06:10,121 because, of all the things that we can do to impact Chris's longevity, 95 00:06:10,536 --> 00:06:13,656 periodic fasting may be one of the more effective. 96 00:06:18,669 --> 00:06:20,799 My food contains glucose. 97 00:06:22,924 --> 00:06:26,094 The fuel that feeds the trillions of healthy cells in my body. 98 00:06:29,097 --> 00:06:31,677 But that glucose also feeds something else... 99 00:06:33,476 --> 00:06:34,636 zombie cells. 100 00:06:35,311 --> 00:06:39,441 Old, damaged cells that have lingered beyond their useful life. 101 00:06:40,024 --> 00:06:46,324 By spewing toxic sludge, these zombies infect other healthy cells, 102 00:06:46,906 --> 00:06:48,986 speeding up the aging process. 103 00:06:51,411 --> 00:06:53,871 Everything from hair loss and wrinkles 104 00:06:54,122 --> 00:06:57,712 to the onset of arthritis, cancer, and dementia. 105 00:06:59,794 --> 00:07:03,884 But what scientists have realized is that when we fast and cut off 106 00:07:03,965 --> 00:07:05,295 the supply of glucose, 107 00:07:05,842 --> 00:07:10,642 that zombie army is starved of energy which saps them of their power. 108 00:07:13,182 --> 00:07:15,142 -It's long-term gain 109 00:07:15,226 --> 00:07:16,476 for short-term pain. 110 00:07:17,603 --> 00:07:20,943 For a food lover like me, lots of pain. 111 00:07:26,696 --> 00:07:27,696 Yeah, I'm hungry. 112 00:07:29,031 --> 00:07:30,991 -We are not gonna make it. 113 00:07:31,617 --> 00:07:34,327 And by "we," I mean me and my best mates. 114 00:07:36,164 --> 00:07:40,254 If anybody can help me get through this, they can, so I'm very, very pleased 115 00:07:40,334 --> 00:07:42,844 and thankful that they've agreed to fast with me. 116 00:07:43,129 --> 00:07:45,259 We're buddies from high school... 117 00:07:45,506 --> 00:07:47,506 -Yeah. -...primary school to Chris. 118 00:07:47,717 --> 00:07:49,297 -I'm Aaron. This is Luke. -Yep. 119 00:07:49,469 --> 00:07:50,889 And now we work for Chris. 120 00:07:50,970 --> 00:07:53,930 -So we're paid friends, really. -Yes. With benefits. 121 00:07:54,015 --> 00:07:55,845 -With benefits, and, yeah... -We're a little family. 122 00:07:56,017 --> 00:07:57,387 We're a little family. 123 00:07:57,602 --> 00:07:59,272 CHRIS: Having a bit of moral support could be good. 124 00:08:00,146 --> 00:08:02,106 Are you doing it all the way? Aaron, you're doing four days. 125 00:08:02,190 --> 00:08:03,230 -Yeah. -Yeah. 126 00:08:03,357 --> 00:08:04,937 -No. -No, you're gonna try. 127 00:08:05,109 --> 00:08:06,239 Yeah, I'll try. 128 00:08:09,071 --> 00:08:11,031 -He loves his food. -The angriest he's ever got at me 129 00:08:11,115 --> 00:08:12,825 -was because I bought him too small... 130 00:08:12,909 --> 00:08:14,489 ...a steak once, in London. 131 00:08:14,994 --> 00:08:18,214 He almost punched me out 'cause it was like that, and he was like, 132 00:08:18,289 --> 00:08:20,419 "Look at the size of me. Why would you buy me that steak?" 133 00:08:20,541 --> 00:08:22,131 I mean, he's not gonna do four days. 134 00:08:25,338 --> 00:08:26,878 I'm cracking. 135 00:08:27,924 --> 00:08:29,844 We're days away from eating, not, like, hours. 136 00:08:30,009 --> 00:08:33,549 It's not like we can go home and smash a big bowl of spaghetti. 137 00:08:35,515 --> 00:08:41,845 Forget pasta, our next meal, with a bit of luck, is a big, juicy fish. 138 00:08:46,984 --> 00:08:49,284 But if I'm gonna be the designated fish catcher... 139 00:08:50,279 --> 00:08:52,199 I'll need some serious dive training. 140 00:08:53,908 --> 00:08:57,448 So, Peter has hooked me up with someone with a remarkable set of skills. 141 00:08:59,455 --> 00:09:03,535 I'll give you a brief demo. I'm gonna start with a really big exhale. 142 00:09:04,293 --> 00:09:06,883 -Wow. 143 00:09:19,684 --> 00:09:20,984 -Huge expansion there. -Okay. 144 00:09:21,060 --> 00:09:22,350 That was incredible. 145 00:09:25,231 --> 00:09:28,731 CHRIS: Tanya Streeter is a breath-holding phenomenon. 146 00:09:31,195 --> 00:09:33,565 She's a ten-time free diving world champion... 147 00:09:36,450 --> 00:09:39,370 and can hold her breath for an amazing six minutes. 148 00:09:43,040 --> 00:09:47,340 What we do as average human beings, is we breathe in the top part 149 00:09:47,628 --> 00:09:50,968 of our chest, but you're not getting a lot of oxygen into your blood like that. 150 00:09:51,132 --> 00:09:53,882 There's a greater capacity in the lower part of your lungs, 151 00:09:54,176 --> 00:09:58,176 and you can't access that unless you relax your abs. 152 00:09:58,681 --> 00:10:03,311 You basically learn to stick your stomach out as you breathe in. 153 00:10:18,242 --> 00:10:21,202 -All right, how're you feeling? -Ready to set some records. 154 00:10:21,454 --> 00:10:22,624 Let's do it. 155 00:10:31,255 --> 00:10:33,215 So, is that the goal, the orange thing there? 156 00:10:33,341 --> 00:10:35,091 Sure, there and back, man. 157 00:10:35,176 --> 00:10:36,586 And what's that, about 50 meters? 158 00:10:36,719 --> 00:10:39,009 -No, that's about 100 meters. -Oh, is it? 159 00:10:39,430 --> 00:10:40,850 Be rather claustrophobic under there. 160 00:10:41,557 --> 00:10:44,227 Yeah. We've linked up a guideline, 'cause it's pretty dark, 161 00:10:44,310 --> 00:10:46,310 but it gives me an opportunity to see what you're made of, 162 00:10:46,395 --> 00:10:49,565 -mentally as well as physically. -Okay, we'll see. 163 00:10:57,448 --> 00:10:58,988 All right, whenever you're ready, Chris. 164 00:11:10,586 --> 00:11:15,876 It was really poor visibility and instantly, my lungs are burning. 165 00:11:27,520 --> 00:11:29,190 I hear in my head... 166 00:11:29,814 --> 00:11:31,824 that I should give up and I'm running out of air. 167 00:11:36,570 --> 00:11:38,990 And I'm trying to override that 'cause I know 168 00:11:39,073 --> 00:11:41,783 that there is a lot more oxygen in my lungs than you'd think. 169 00:11:47,873 --> 00:11:49,963 And surely, I must be there by now. 170 00:11:56,257 --> 00:11:58,337 -Almost halfway. -I don't think so. 171 00:11:59,969 --> 00:12:02,559 -Not even close. Twenty meters. -How many meters was that? 172 00:12:03,431 --> 00:12:04,931 I don't think you quite made it 20. 173 00:12:06,058 --> 00:12:08,688 Yeah, I'm a little disappointed. 174 00:12:08,894 --> 00:12:13,234 Turns out, I was under for a whopping 27 seconds. 175 00:12:17,361 --> 00:12:20,281 I'm actually quite surprised how ineffective and useless 176 00:12:20,448 --> 00:12:21,818 my free diving skills are. 177 00:12:22,366 --> 00:12:26,036 I know I can hold my breath on land for a few minutes, but, in the water, 178 00:12:26,162 --> 00:12:28,752 when you're kicking and using up air and energy, 179 00:12:28,831 --> 00:12:31,381 it's... it's just a whole different story. 180 00:12:33,085 --> 00:12:36,045 Diving for my dinner is gonna be harder than I thought. 181 00:12:38,799 --> 00:12:40,009 Speaking of food... 182 00:12:49,810 --> 00:12:51,230 CHRIS: ...I don't even like broccoli. 183 00:13:04,158 --> 00:13:05,988 And even though I've got homework to do... 184 00:13:07,119 --> 00:13:12,669 without mealtimes to punctuate the day, time just seems to drag on. 185 00:13:18,881 --> 00:13:23,641 It's, uh, almost dinnertime, and this is the worst I've felt. 186 00:13:25,221 --> 00:13:32,191 Feel pretty light-headed... ...super weak and incredibly hungry. 187 00:13:42,780 --> 00:13:45,490 -I feel tired. I didn't sleep very well. 188 00:13:45,574 --> 00:13:47,454 I woke up a lot feeling really hungry 189 00:13:47,618 --> 00:13:48,658 and then, um... 190 00:13:50,162 --> 00:13:53,042 I... You know, feel empty, empty of food. 191 00:13:53,123 --> 00:13:56,923 Almost as if I'm empty of, like, energy. Feel very flat. 192 00:13:57,294 --> 00:14:00,674 Now, cooking this. I feel hungry. 193 00:14:02,675 --> 00:14:03,875 Why can't you eat? 194 00:14:04,051 --> 00:14:05,301 'Cause I'm not supposed to eat. 195 00:14:05,845 --> 00:14:07,505 For how long, Dad? 196 00:14:07,888 --> 00:14:08,928 Four days, bro. 197 00:14:09,557 --> 00:14:10,597 Why? 198 00:14:10,683 --> 00:14:15,733 I'm not even remotely tempted by this delicious, crispy bacon and eggs. 199 00:14:19,525 --> 00:14:23,735 The second day of a water-only fast is an especially difficult day. 200 00:14:24,113 --> 00:14:28,243 And the reason for this is that the body's primary reserves of glucose, 201 00:14:28,450 --> 00:14:30,330 which are kept in the liver and in the muscles, 202 00:14:30,494 --> 00:14:34,084 are starting to get rapidly depleted. And as a result of this, 203 00:14:34,164 --> 00:14:36,334 Chris is feeling really tired and groggy. 204 00:14:37,084 --> 00:14:40,214 But it's important for him to understand that this is okay, 205 00:14:40,588 --> 00:14:42,838 because there are some people who routinely do this 206 00:14:42,965 --> 00:14:46,925 and not only do they not starve, but they actually manage to thrive. 207 00:15:00,691 --> 00:15:02,651 Hey... You missed... 208 00:15:05,821 --> 00:15:06,861 Listen son, 209 00:15:06,947 --> 00:15:09,907 if you can't hit the target, 210 00:15:09,992 --> 00:15:11,122 the village won't eat. 211 00:15:12,202 --> 00:15:13,252 Try again. 212 00:15:16,332 --> 00:15:17,672 I'll try my best Dad... 213 00:15:18,292 --> 00:15:19,882 Yeah, well done. 214 00:15:20,669 --> 00:15:23,299 Isafiri is a member of the Hadza tribe. 215 00:15:28,594 --> 00:15:29,804 He's a hunter. 216 00:15:33,057 --> 00:15:34,807 We are hungry, 217 00:15:34,892 --> 00:15:36,772 and we have run out of food. 218 00:15:37,186 --> 00:15:39,056 Yeah, okay. 219 00:15:39,229 --> 00:15:40,979 I will hunt tomorrow. 220 00:15:41,273 --> 00:15:45,073 I will catch something big. 221 00:15:48,280 --> 00:15:53,080 ISAFIRI: Being hungry is part of life here. 222 00:15:53,994 --> 00:15:55,084 Sometimes we don't eat for days. 223 00:15:56,413 --> 00:15:57,753 But we are not afraid. 224 00:15:58,540 --> 00:16:01,130 because I know we won't starve. 225 00:16:04,922 --> 00:16:06,552 Look, we should hunt there... 226 00:16:07,299 --> 00:16:09,589 Come around from the side. 227 00:16:14,556 --> 00:16:15,806 Being hungry... 228 00:16:18,268 --> 00:16:19,598 makes me a better hunter. 229 00:16:24,692 --> 00:16:28,072 Even after days without food, people like the Hadza 230 00:16:28,153 --> 00:16:30,573 are still able to find the energy to hunt... 231 00:16:31,699 --> 00:16:33,779 Look, dik-dik antelop e has taken a poop. 232 00:16:34,284 --> 00:16:35,954 ...because when a person fasts, 233 00:16:36,704 --> 00:16:38,004 when you stop eating... 234 00:16:38,205 --> 00:16:41,415 I think he is close by. 235 00:16:42,084 --> 00:16:44,634 ...it reveals the body's superpower. 236 00:16:46,171 --> 00:16:49,431 CHRIS: When food is plentiful, our body stores excess energy 237 00:16:49,508 --> 00:16:53,508 in the form of fat under the skin and around the internal organs. 238 00:16:54,972 --> 00:16:56,352 When food is scarce... 239 00:16:59,226 --> 00:17:00,976 that fat is sent to the liver... 240 00:17:05,649 --> 00:17:09,359 where it's turned into an alternative fuel source called a ketone. 241 00:17:09,778 --> 00:17:13,698 And it's these ketones which provide the emergency power source. 242 00:17:13,866 --> 00:17:17,996 Not only for our bodies, but also our brains. 243 00:17:24,585 --> 00:17:26,245 Along with an energy boost, 244 00:17:26,420 --> 00:17:29,550 it seems ketones also sharpen mental focus. 245 00:17:32,092 --> 00:17:35,552 Heightening the ability to see, hear... 246 00:17:37,139 --> 00:17:39,179 and sense things in the environment... 247 00:17:42,269 --> 00:17:44,399 that we normally wouldn't be able to perceive. 248 00:17:46,899 --> 00:17:49,149 And ketone production ramps up... 249 00:17:51,820 --> 00:17:54,700 just when a hunter needs it most. 250 00:17:56,366 --> 00:17:57,786 The dik-dik is in there... 251 00:18:01,455 --> 00:18:03,115 When you're getting closer, 252 00:18:05,209 --> 00:18:08,669 your mind becomes alert to the wild. 253 00:18:10,422 --> 00:18:12,552 The animal is your only goal. 254 00:18:37,032 --> 00:18:38,532 Yes. it's a dik-dik. 255 00:18:39,201 --> 00:18:40,741 We got it, we got it! 256 00:18:51,797 --> 00:18:53,757 Everyone is happy. 257 00:18:55,092 --> 00:18:56,392 when I bring home meat. 258 00:19:00,806 --> 00:19:02,306 Our children 259 00:19:04,101 --> 00:19:05,521 and our wives are happy. 260 00:19:05,769 --> 00:19:06,979 Everyone is happy. 261 00:19:09,606 --> 00:19:12,276 Ketones help the Hadza hunt when food is scarce. 262 00:19:14,695 --> 00:19:17,695 And I'm pretty sure I'm gonna need some ketones of my own 263 00:19:18,031 --> 00:19:20,411 if I'm gonna catch a fish in two days' time. 264 00:19:23,537 --> 00:19:24,827 Little prick here. 265 00:19:32,296 --> 00:19:33,506 Didn't hurt that much. 266 00:19:35,048 --> 00:19:37,628 So, I'm checking ketones on two different meters. 267 00:19:37,718 --> 00:19:38,718 Mmm. 268 00:19:38,844 --> 00:19:41,104 They're in pretty good agreement at about one, 269 00:19:41,430 --> 00:19:43,140 and over time, this will go up. 270 00:19:43,432 --> 00:19:45,182 -There's more of them in my system now? -Yeah. 271 00:19:45,309 --> 00:19:46,439 Or I'm producing more? 272 00:19:46,560 --> 00:19:49,100 Exactly. Actually, around ten times more. 273 00:19:50,522 --> 00:19:52,272 -And that's pretty low. -Right. 274 00:19:52,649 --> 00:19:56,569 But hopefully today, tomorrow is when we'll start to see that transition 275 00:19:56,737 --> 00:19:58,067 -where once you get over... -Yeah. 276 00:19:58,155 --> 00:20:00,445 ...two and into three, that's when you start 277 00:20:00,532 --> 00:20:03,122 to kinda feel, like you're in the Matrix a little bit. You kinda seeing things 278 00:20:03,243 --> 00:20:04,493 -a little bit different. -Yeah. 279 00:20:04,912 --> 00:20:06,162 And what about the zombie cells? 280 00:20:06,246 --> 00:20:08,826 Do you think my body's getting rid of them at the moment? 281 00:20:08,999 --> 00:20:10,669 You're in the process of starting that, yeah. 282 00:20:10,751 --> 00:20:12,671 -I... I think that comes in hand... -Good to know. 283 00:20:12,753 --> 00:20:15,423 ...with this transition to, uh, ketones, 284 00:20:15,672 --> 00:20:19,302 and so, as the body starts sort of adapting to what's going on... 285 00:20:19,384 --> 00:20:21,014 -Hmm. -...it's gonna start to reprioritize 286 00:20:21,094 --> 00:20:23,604 and hopefully, it's knocking those guys out. 287 00:20:23,847 --> 00:20:24,887 Good. 288 00:20:27,851 --> 00:20:29,691 CHRIS: So, the war on zombies has begun... 289 00:20:30,687 --> 00:20:32,477 but no ketone boost yet. 290 00:20:33,941 --> 00:20:38,151 Which is a little worrying 'cause I'm off for more dive training. 291 00:20:38,445 --> 00:20:40,565 Can't say I'm swimming in energy. 292 00:20:40,822 --> 00:20:43,242 -I'm... My ability to speak is... 293 00:20:43,408 --> 00:20:46,698 ...rapidly declining. How do you guys feel? 294 00:20:47,287 --> 00:20:49,997 Yeah, it's kinda peaks and troughs, isn't it? 295 00:20:50,082 --> 00:20:52,212 -It is a definite a roller coaster. -It's like... It's a real... 296 00:20:52,292 --> 00:20:54,132 It's a roller coaster of emotions. Uh-huh. 297 00:20:54,253 --> 00:20:55,923 At the moment, I'm up, but there will be 298 00:20:56,004 --> 00:20:57,764 -a time tonight when I'm down. -Hmm. 299 00:21:06,390 --> 00:21:09,270 So, another Peter and Tanya training gig. 300 00:21:11,270 --> 00:21:13,520 This time, underwater hockey. 301 00:21:21,989 --> 00:21:23,989 They say it's gonna help me catch a fish. 302 00:21:24,908 --> 00:21:26,698 -Hey, guys. -Hey, how's it going? 303 00:21:27,160 --> 00:21:30,290 CHRIS: They also think, maybe it'll help keep my mind off the fast. 304 00:21:33,292 --> 00:21:34,882 Well, it ain't working. 305 00:21:36,295 --> 00:21:39,165 What else would you wanna do when you're fasting, tired, and starving? 306 00:21:39,464 --> 00:21:40,924 Learn a new sport. 307 00:21:41,591 --> 00:21:45,681 And nothing against underwater hockey, it's cool, but right now, 308 00:21:45,971 --> 00:21:47,141 I just wanna eat. 309 00:21:56,148 --> 00:21:58,438 Now, it's rough down there, but it's actually really good 310 00:21:58,525 --> 00:22:00,895 for spearfishing. There's this sudden burst of energy, there's... 311 00:22:00,986 --> 00:22:02,316 -Yeah. -You know, you don't know 312 00:22:02,404 --> 00:22:04,954 when you're gonna have to dive, so you have to be super, super efficient. 313 00:22:05,073 --> 00:22:06,123 -Oh, okay. -Okay? 314 00:22:06,199 --> 00:22:07,529 Yeah. 315 00:22:07,701 --> 00:22:09,081 Peter's playing for the reds. 316 00:22:12,122 --> 00:22:14,252 Me for the blues. Number seven. 317 00:22:16,251 --> 00:22:19,341 And my co-fasting best buddies, cheerleaders. 318 00:22:25,177 --> 00:22:28,177 I feel like I'm watching my son go off to battle or something. I'm nervous. 319 00:22:28,263 --> 00:22:29,933 -I'm real anxious. -I'm just worried about... 320 00:22:30,015 --> 00:22:31,515 I'm worried about that because without that... 321 00:22:31,600 --> 00:22:33,810 -We don't have a job. -...we don't have a job, so... 322 00:22:33,894 --> 00:22:35,524 -We can't really... -Look after his face, please. 323 00:22:35,604 --> 00:22:36,734 Don't touch his face, please. 324 00:22:43,945 --> 00:22:45,355 Things don't start so well. 325 00:22:46,865 --> 00:22:50,195 Ooh! Oh, oh, oh, oh. He's taking a beating. 326 00:22:51,119 --> 00:22:52,789 Now, holding your breath is one thing... 327 00:22:53,163 --> 00:22:57,883 but doing it while being pushed and shoved, and thrown around, and so on, 328 00:22:57,959 --> 00:22:59,249 it's just a whole other thing. 329 00:23:00,003 --> 00:23:01,093 It's pretty intense. 330 00:23:06,927 --> 00:23:08,847 My need for air is overpowering. 331 00:23:16,853 --> 00:23:19,693 If that puck was a fish, I wouldn't get anywhere near it. 332 00:23:26,488 --> 00:23:27,738 Oh! 333 00:23:28,490 --> 00:23:30,530 -Well done, Peter. 334 00:23:31,159 --> 00:23:32,239 Good goal. 335 00:23:35,831 --> 00:23:39,001 Half time, and it couldn't have come quick enough. 336 00:23:43,422 --> 00:23:45,172 -How are you doing? -It's exhausting. 337 00:23:45,340 --> 00:23:47,380 -I know. -Just trying to work out, 338 00:23:47,551 --> 00:23:50,261 you know, when to conserve your energy, and when to dive, and make sure 339 00:23:50,387 --> 00:23:52,557 you dive when the puck's coming as opposed to waiting under there 340 00:23:52,639 --> 00:23:54,599 -and then by the time it gets there... -Yeah. Yeah. No, no! 341 00:23:54,724 --> 00:23:56,774 -...you've got nothing left. It's like... -Yeah. No waiting. 342 00:23:57,060 --> 00:23:58,400 But you got all the oxygen you need, 343 00:23:58,520 --> 00:24:00,060 -so it's mental. Your stamina becomes... -Yeah. 344 00:24:00,147 --> 00:24:01,227 ...really mental at this point. 345 00:24:01,481 --> 00:24:02,771 -Sure. Yeah. 346 00:24:02,858 --> 00:24:05,648 Okay? So, just try to take some long, slow, deep breaths. So... 347 00:24:05,819 --> 00:24:09,199 -Through your mouth. 348 00:24:13,702 --> 00:24:15,202 -Do you feel better? -I feel good. 349 00:24:15,495 --> 00:24:16,745 Okay, good. 350 00:24:18,874 --> 00:24:20,464 -Okay. 351 00:24:33,096 --> 00:24:34,846 CHRIS: I don't know if it's the half time coaching 352 00:24:34,973 --> 00:24:36,273 or something else... 353 00:24:37,934 --> 00:24:40,314 but I feel a little different. 354 00:24:45,984 --> 00:24:47,654 My need for air is less urgent. 355 00:24:51,281 --> 00:24:52,821 I feel more efficient in the water. 356 00:24:55,285 --> 00:24:57,575 More aware of the other players around me. 357 00:24:59,372 --> 00:25:01,002 And I'm focused on the puck. 358 00:25:06,463 --> 00:25:09,763 And I feel a slight surge of energy. 359 00:25:11,468 --> 00:25:12,678 Just enough... 360 00:25:15,138 --> 00:25:16,308 to score. 361 00:25:35,116 --> 00:25:37,406 -How do you feel? -I feel all right now. 362 00:25:37,494 --> 00:25:39,084 -Yeah. -I feel much better than I did 363 00:25:39,246 --> 00:25:40,456 -prior to playing. -Me, too. 364 00:25:40,580 --> 00:25:41,620 Yeah. Why is that? 365 00:25:41,998 --> 00:25:43,918 I think we're probably making more ketones at the moment, 366 00:25:44,000 --> 00:25:45,540 our bodies are trying to ramp up production. 367 00:25:45,627 --> 00:25:47,667 -It's basically saying... -It thinks... thinks we're hunting.. 368 00:25:47,754 --> 00:25:48,924 -Exactly, it's like... -Yeah. 369 00:25:49,047 --> 00:25:51,297 ..."Hey, they're... they're hunting. They're getting us food." Um... 370 00:25:51,383 --> 00:25:52,973 I wouldn't be surprised if in an hour or two, 371 00:25:53,093 --> 00:25:54,553 -we feel a little worse. -Yeah. 372 00:25:54,970 --> 00:25:56,810 'Cause it'll realize, "We haven't got the food." 373 00:25:56,930 --> 00:25:58,470 -"We've been kinda let down," 374 00:25:58,557 --> 00:26:00,177 and... and then, sort of, that production level 375 00:26:00,267 --> 00:26:01,727 will come down a bit. 376 00:26:07,065 --> 00:26:08,725 That doesn't help though, does it? 377 00:26:09,276 --> 00:26:10,816 Oh, for heaven's sakes. 378 00:26:12,237 --> 00:26:14,567 Just as I was beginning to feel a bit better... 379 00:26:14,739 --> 00:26:16,159 -Oh. -They're doing it on purpose. 380 00:26:16,241 --> 00:26:18,161 A familiar feeling returns. 381 00:26:18,785 --> 00:26:21,245 -See, now I'm hungry again. 382 00:26:21,329 --> 00:26:23,329 Still, at least my best mates are fasting with me. 383 00:26:24,457 --> 00:26:25,707 And they never let me down. 384 00:26:39,931 --> 00:26:41,981 -Hey, Chris! -Hey! 385 00:26:43,268 --> 00:26:44,268 What the... 386 00:26:44,477 --> 00:26:47,307 Sorry, mate, we couldn't do it. This is so good. 387 00:26:47,731 --> 00:26:48,861 Are you 388 00:26:49,733 --> 00:26:51,113 Come and have a slice, mate. 389 00:26:51,276 --> 00:26:54,106 Two minutes ago, I was like, "It really helps the guys 390 00:26:54,279 --> 00:26:56,409 "are doing it with me, you know, 'cause I'm like... 391 00:26:56,656 --> 00:26:58,656 "I'm like feeling sluggish." I'm like, "Oh, I feel bad." 392 00:26:58,742 --> 00:27:00,622 But then I'm like, "Oh, actually, they're laughing..." 393 00:27:00,702 --> 00:27:02,202 -"...and I gotta keep it up." 394 00:27:02,287 --> 00:27:05,117 You know, "We're all in this tog... together." That was three minutes ago. 395 00:27:05,749 --> 00:27:07,249 And I'd love to tell you it's not that good, 396 00:27:07,334 --> 00:27:09,134 -but it's honestly the best thing ever. -Mm-hmm. 397 00:27:09,961 --> 00:27:11,961 -What, I thought you were fasting? -That's what I said. 398 00:27:12,047 --> 00:27:14,547 Both of them were fasting. I said to them, like, I... like, I... like, I... 399 00:27:14,758 --> 00:27:15,928 Just have a smell of that. 400 00:27:16,635 --> 00:27:18,965 -Cool. -I gotta say, I really thought 401 00:27:19,054 --> 00:27:20,144 you were gonna hang tough. 402 00:27:20,221 --> 00:27:23,431 I was gonna, but then this is the best milkshake I've ever had. 403 00:27:23,642 --> 00:27:25,562 -Good luck finding... -Oh, my God. 404 00:27:26,436 --> 00:27:28,766 I can smell the pizza. I'll just go away. I can smell it. 405 00:27:38,448 --> 00:27:42,328 CHRIS: Great, my best buddies have bailed, and just as Peter predicted, 406 00:27:42,410 --> 00:27:47,210 the ketone pick-me-up has gone, and I feel terrible. 407 00:27:47,457 --> 00:27:50,667 Okay, so this is, uh, day three. 408 00:27:51,127 --> 00:27:54,167 Feeling pretty weak. Didn't sleep very much last night. 409 00:27:54,255 --> 00:27:55,915 I feel like my sleep's getting worse and worse. 410 00:27:56,007 --> 00:27:58,717 You know, last night was really hard, giving the kids dinner. 411 00:27:58,802 --> 00:28:05,352 They had, um, delicious, like, roast lamb, and vegetables, and... and fruit, and... 412 00:28:06,184 --> 00:28:08,314 and I saw a chocolate brownie in there somewhere. 413 00:28:09,104 --> 00:28:13,824 Multiple occasions, I... I... I... I thought about just ripping that food 414 00:28:13,900 --> 00:28:16,650 straight out of their hands. Feel pretty weak trying to walk up 415 00:28:16,820 --> 00:28:21,030 the stairs, trying to walk down the hall, I feel like it's tough to catch my breath. 416 00:28:21,116 --> 00:28:25,366 Uh, but, you know, day three, and, um... 417 00:28:26,830 --> 00:28:28,620 I guess we're almost there. It's only... 418 00:28:30,041 --> 00:28:36,261 12, 48, I don't know, I can't even think. Like, I... Don't know. 419 00:28:38,717 --> 00:28:40,297 I'm losing it. 420 00:28:54,899 --> 00:28:59,279 I'm trying to get my ketones going again by working out, but I'm feeling nothing. 421 00:29:09,080 --> 00:29:13,170 Oh, and did I mention that I'm feeling really, really hungry? Hmm? 422 00:29:18,047 --> 00:29:21,547 I don't think Chris has found this to be a pleasant experience at all. 423 00:29:22,260 --> 00:29:23,800 -But a big part of fasting... 424 00:29:23,887 --> 00:29:25,927 ...is understanding why you're doing it. 425 00:29:26,473 --> 00:29:28,813 And that's the key to tolerating this thing. 426 00:29:29,100 --> 00:29:32,690 It's being able to focus on the motivation behind the fast. 427 00:29:33,897 --> 00:29:36,437 One of the benefits is, you have a family. 428 00:29:36,524 --> 00:29:38,284 -Yeah. -And you can sort of see 429 00:29:38,401 --> 00:29:42,411 how much you enjoy that, and that's kind of the anchor, 430 00:29:42,572 --> 00:29:43,952 -I think, um... -Yeah. 431 00:29:44,324 --> 00:29:48,164 You can actually look into the eyes of the people for whom it matters 432 00:29:48,244 --> 00:29:49,374 the most to you. 433 00:29:49,579 --> 00:29:52,459 Yeah, sure. I like that motivation, you know? 434 00:29:52,624 --> 00:29:54,174 Anything that stops me thinking about food 435 00:29:54,250 --> 00:29:57,550 is sort of a... a good thing at this point, so... 436 00:29:59,339 --> 00:30:06,049 Asking Chris for his very first fast to go as long as four days is a big ask. 437 00:30:13,561 --> 00:30:15,811 But I really need him to continue now. 438 00:30:18,024 --> 00:30:21,154 Because once a human goes three days without food, 439 00:30:21,694 --> 00:30:26,204 we think some remarkable biochemical changes take place 440 00:30:26,825 --> 00:30:29,405 that have significant longevity benefits. 441 00:30:33,498 --> 00:30:36,578 CHRIS: Remember those toxic zombie cells aging my body? 442 00:30:37,001 --> 00:30:39,751 Well, they're not the only things getting dealt with. 443 00:30:40,380 --> 00:30:43,680 Even inside my healthy cells, there's wear and tear. 444 00:30:44,509 --> 00:30:47,299 But scientists think that without food to process, 445 00:30:47,554 --> 00:30:50,274 those cells can switch into repair mode, 446 00:30:50,849 --> 00:30:55,599 fixing damage, cleaning up garbage, nipping any problems in the bud. 447 00:30:58,606 --> 00:31:01,896 With the zombies in check and the rest of me in tip-top condition... 448 00:31:03,027 --> 00:31:06,987 the future looks healthier and also longer. 449 00:31:08,116 --> 00:31:10,826 Science is only just beginning to understand 450 00:31:10,910 --> 00:31:13,040 the longevity benefits of fasting. 451 00:31:14,247 --> 00:31:17,457 In fact, we're just catching up with the cultures and religions 452 00:31:17,542 --> 00:31:21,632 that have placed fasting at the center of their practice for millennia. 453 00:31:29,596 --> 00:31:31,636 Today is a beautiful day. 454 00:31:34,767 --> 00:31:37,397 CHRIS : Retired teacher Todesso and his family 455 00:31:37,520 --> 00:31:40,270 are celebrating Easter with a walk to church. 456 00:31:42,692 --> 00:31:45,742 Papa, are we nearly there yet? 457 00:31:47,030 --> 00:31:48,360 No, not yet. 458 00:31:49,240 --> 00:31:51,870 But the church is three days away 459 00:31:52,744 --> 00:31:54,414 in the holy city of Gondar. 460 00:31:56,623 --> 00:31:57,923 Are you tired? 461 00:31:57,999 --> 00:31:59,329 Yes I'm tired. 462 00:31:59,417 --> 00:32:02,207 Don't be tired, be strong. 463 00:32:03,922 --> 00:32:05,722 During their grueling pilgrimage, 464 00:32:05,840 --> 00:32:08,090 the family eat absolutely nothing. 465 00:32:09,719 --> 00:32:13,179 Fasting is very important to us, 466 00:32:13,681 --> 00:32:16,941 it is a tradition handed down by our ancestors. 467 00:32:17,518 --> 00:32:18,808 We fast to be closer to God. 468 00:32:20,229 --> 00:32:21,269 Come on you two. 469 00:32:21,356 --> 00:32:23,016 I'll be so happy when we get there. 470 00:32:24,651 --> 00:32:26,441 I got you. 471 00:32:27,654 --> 00:32:30,824 CHRIS: And joining her parents for the first time is daughter Helen. 472 00:32:31,407 --> 00:32:35,327 The first day was the hardest. 473 00:32:36,329 --> 00:32:38,209 I felt so weak. 474 00:32:43,628 --> 00:32:47,468 My brain was telling me, "You can do this." 475 00:32:48,049 --> 00:32:51,549 But my stomach was saying, "Bring me food!" 476 00:32:52,845 --> 00:32:55,635 But fasting isn't just bringing them closer to God... 477 00:32:56,724 --> 00:32:59,144 they believe it's bringing them health benefits. 478 00:33:00,812 --> 00:33:04,402 Although my father is 75 years old, he is very strong. 479 00:33:05,191 --> 00:33:07,111 I have never seen him sick. 480 00:33:08,194 --> 00:33:11,704 He swears fasting is why. 481 00:33:16,119 --> 00:33:19,119 I started fasting when I was seven. 482 00:33:19,956 --> 00:33:22,076 And I've been doing it for 68 years. 483 00:33:24,043 --> 00:33:27,013 It keeps me feeling healthy. 484 00:33:31,592 --> 00:33:37,602 I have never been affected by a common cold, 485 00:33:38,391 --> 00:33:41,851 or any other disease. 486 00:33:43,354 --> 00:33:45,444 Look, Gondar is just over the mountain. 487 00:33:45,606 --> 00:33:46,816 HELEN I can see it... 488 00:33:46,899 --> 00:33:48,069 Come on. 489 00:33:52,196 --> 00:33:53,236 I can smell incense. 490 00:33:59,746 --> 00:34:01,246 Easter isn't the only time 491 00:34:01,330 --> 00:34:03,370 Ethiopian Orthodox Christians fast. 492 00:34:04,709 --> 00:34:09,669 In fact, they observe up to 250 fasting days a year, 493 00:34:10,006 --> 00:34:13,586 during which they vary their practice, sometimes eating nothing, 494 00:34:13,885 --> 00:34:17,215 and others, restricting how much or when they eat. 495 00:34:18,514 --> 00:34:20,894 All these smells So much food. 496 00:34:22,101 --> 00:34:24,061 Gondar is an amazing place. 497 00:34:26,939 --> 00:34:29,189 There are many ways to go about fasting. 498 00:34:29,609 --> 00:34:31,279 There are countless protocols. 499 00:34:31,778 --> 00:34:34,658 But remember, they all have one thing in common. 500 00:34:35,031 --> 00:34:37,991 They reduce the number of calories we consume. 501 00:34:38,493 --> 00:34:42,253 And in a world where so many of us are over-nourished, 502 00:34:42,663 --> 00:34:47,133 this is an essential part of how we can go about living a longer, 503 00:34:47,418 --> 00:34:49,798 -healthier life. 504 00:34:53,758 --> 00:34:58,678 I am very proud of myself for doing the fast. 505 00:35:00,890 --> 00:35:02,730 I will do it every year. 506 00:35:04,352 --> 00:35:07,732 I will only stop fasting on the day I die. 507 00:35:17,949 --> 00:35:20,329 Two hundred and fifty fasting days a year. 508 00:35:23,079 --> 00:35:25,919 CHRIS: Makes me think, "Surely, I can go another 24 hours... 509 00:35:27,667 --> 00:35:29,167 "can't I?" 510 00:35:30,294 --> 00:35:33,094 Struggling, struggling I'm struggling 511 00:35:36,425 --> 00:35:39,255 I'm on the ferry to our dive base in the Great Barrier Reef... 512 00:35:43,266 --> 00:35:45,766 ...and I could really do with a ketone pick-me-up. 513 00:35:49,772 --> 00:35:53,572 -I had a little, like... 514 00:35:53,651 --> 00:35:55,281 ...like an hour ago, a little burst of energy. 515 00:35:55,361 --> 00:35:58,661 I thought, "Oh, this is good." Now... 516 00:36:21,095 --> 00:36:22,255 CHRIS: So, this is it. 517 00:36:22,722 --> 00:36:26,562 The last day of the fast, and the day I'm supposed to catch dinner 518 00:36:26,642 --> 00:36:30,272 for me and Peter. What could possibly go wrong? 519 00:36:30,980 --> 00:36:32,610 So, how are you feeling this morning? 520 00:36:32,732 --> 00:36:35,322 Uh, pretty weak. Pretty... Pretty low energy. 521 00:36:35,443 --> 00:36:37,203 I feel like I've just rolled out of bed. 522 00:36:37,320 --> 00:36:41,070 You know, even though you don't feel it, at the microscopic level, 523 00:36:41,157 --> 00:36:43,327 inside your body, there's a war going on. 524 00:36:43,492 --> 00:36:45,622 And that war is being won by the good guys. 525 00:36:45,828 --> 00:36:46,868 Hmm. 526 00:36:46,954 --> 00:36:49,174 And that's the real reason we're doing this. 527 00:36:49,332 --> 00:36:52,292 -Yeah. -All right, let's see what we got here. 528 00:36:54,545 --> 00:36:58,045 CHRIS: So, I could live longer, but right now, 529 00:36:58,257 --> 00:37:00,007 I'm not sure I'm gonna make it through the day. 530 00:37:03,971 --> 00:37:06,681 So, remind me, where were my ketone levels yesterday? 531 00:37:06,891 --> 00:37:09,481 So, yesterday, you were at about one. 532 00:37:12,897 --> 00:37:14,437 -Now, you're almost at two. -Yeah. 533 00:37:14,607 --> 00:37:17,567 -When the ketones get closer to three... -Yeah. 534 00:37:17,693 --> 00:37:19,363 ...is really when that switch is flipped. 535 00:37:19,487 --> 00:37:21,027 -But once you get in the water... -Mmm. 536 00:37:21,113 --> 00:37:22,283 ...I think it's gonna shoot up. 537 00:37:23,074 --> 00:37:26,164 I don't wanna put any pressure on you, but I'm hungry, man. 538 00:37:26,619 --> 00:37:29,619 And seeing as I can't catch a fish with a spear and you can... 539 00:37:31,249 --> 00:37:33,919 I kinda need you to come through on this. The stakes are high... 540 00:37:34,043 --> 00:37:35,253 -Yeah. -...for the both of us. 541 00:37:35,378 --> 00:37:38,708 -All I heard was "steaks." Edible kind. -Yeah. 542 00:37:42,635 --> 00:37:44,965 The stakes are high, and not just for today. 543 00:37:45,805 --> 00:37:48,055 By fasting, Peter says I'm fighting 544 00:37:48,140 --> 00:37:50,690 those zombie cells and repairing healthy ones. 545 00:37:51,644 --> 00:37:54,194 And that could mean a longer, healthier life. 546 00:37:56,148 --> 00:37:59,358 But first, I've gotta go hunt down that fish. 547 00:38:02,280 --> 00:38:04,320 -Welcome aboard. -Thank you so much. 548 00:38:06,242 --> 00:38:07,622 If only I can find the energy. 549 00:38:10,454 --> 00:38:11,964 I'd love some ketones right now. 550 00:38:15,918 --> 00:38:19,548 PETER: Chris's ketone levels have risen, which is what we wanna see. 551 00:38:20,298 --> 00:38:23,968 I know he isn't feeling it yet, but just as in the underwater hockey, 552 00:38:24,385 --> 00:38:28,305 the effort of hunting is going to ramp up these evolutionary adaptations 553 00:38:28,389 --> 00:38:31,349 in his body, giving him the edge he needs. 554 00:38:36,439 --> 00:38:38,019 -Ooh. -Stretch your legs. 555 00:38:38,399 --> 00:38:39,819 -I know. -Just made me really light-headed. 556 00:38:46,782 --> 00:38:48,412 CHRIS: I'm feeling really vague... 557 00:38:50,703 --> 00:38:52,753 and kinda absent from everything. 558 00:38:54,874 --> 00:38:58,594 I was expecting this big flood of energy that he keeps talking about. 559 00:39:02,631 --> 00:39:04,131 It's not kicking in though. 560 00:39:06,927 --> 00:39:08,137 Don't overdo it. 561 00:39:08,679 --> 00:39:11,639 Blackout, or what we refer to as a loss of motor control, is... 562 00:39:11,766 --> 00:39:12,846 is very real. 563 00:39:14,060 --> 00:39:16,520 Yeah. So what are the symptoms 564 00:39:16,604 --> 00:39:20,074 that I'll feel if I need to wave the flag 565 00:39:20,149 --> 00:39:21,529 -of retreat? 566 00:39:21,734 --> 00:39:27,374 Um... There's a fine line between feeling completely empty and done, 567 00:39:27,531 --> 00:39:31,241 and really feeling almost like your head is shaking 568 00:39:31,410 --> 00:39:33,500 -and your hands are shaking a little bit. -Hmm. 569 00:39:33,704 --> 00:39:36,424 I mean, if it's a blackout, you're not gonna feel anything at all 570 00:39:36,499 --> 00:39:37,999 and you're not gonna remember anything at all. 571 00:39:38,376 --> 00:39:41,246 So if I take one look at you and your face tells me that you're done, 572 00:39:41,587 --> 00:39:44,217 doesn't matter how driven you are, you're done and we're gonna get out. 573 00:39:44,298 --> 00:39:45,548 Sure. 574 00:39:47,134 --> 00:39:49,304 Let me know how you're feeling and just don't push it too hard. 575 00:39:49,929 --> 00:39:51,059 -I'm hungry. -I know. 576 00:40:10,074 --> 00:40:11,124 I'm exhausted already. 577 00:40:12,993 --> 00:40:14,163 All right, it's go time. 578 00:40:23,629 --> 00:40:25,049 CHRIS: Right, I'm in. 579 00:40:46,777 --> 00:40:48,647 I know I have enough oxygen in my body... 580 00:40:50,990 --> 00:40:55,490 but I look up and the boat seems so, so far away. 581 00:40:57,663 --> 00:40:59,543 I feel like I'm losing all focus... 582 00:41:00,833 --> 00:41:03,593 and suddenly the urge to breathe is overwhelming. 583 00:41:09,884 --> 00:41:10,974 How do you feel? 584 00:41:12,303 --> 00:41:13,933 Yeah, I just went down there and then went, 585 00:41:14,013 --> 00:41:15,723 "Oh, I need to breathe soon," 586 00:41:15,806 --> 00:41:17,216 and then I felt really weak, and I thought, 587 00:41:17,391 --> 00:41:19,231 -"There's no way I can do this, ever." -Yeah. 588 00:41:21,103 --> 00:41:25,613 I'm feeling so tired. And the energy boost that Peter promised me... 589 00:41:26,692 --> 00:41:27,782 nothing. 590 00:41:31,530 --> 00:41:34,200 So after a brief moment, I go again. 591 00:41:48,714 --> 00:41:51,594 But this time, I start to feel a little different. 592 00:41:54,094 --> 00:41:56,854 As I'm going down, it's like I'm tuning into the ocean. 593 00:41:59,266 --> 00:42:00,476 I can hear every sound. 594 00:42:03,562 --> 00:42:05,192 Time seems to slow down. 595 00:42:10,653 --> 00:42:12,613 And I start to feel a surge of energy. 596 00:42:17,243 --> 00:42:19,953 And then, I see a fish. 597 00:42:40,224 --> 00:42:43,394 -Nice work. You did it. -Got one. Peter... 598 00:42:43,769 --> 00:42:45,769 -...your dinner. 599 00:42:45,938 --> 00:42:48,268 -Hey, nice one. 600 00:42:49,817 --> 00:42:52,437 -Awesome job, man. 601 00:42:52,653 --> 00:42:53,903 He looked great. 602 00:42:55,072 --> 00:42:56,242 You looked great. 603 00:42:58,617 --> 00:43:00,827 -Whoo! 604 00:43:02,580 --> 00:43:05,580 CHRIS: We did another test after the hunt, and the surge of energy, 605 00:43:05,916 --> 00:43:08,876 turns out my ketones had shot up to nearly three. 606 00:43:09,628 --> 00:43:12,668 So it worked. The science came good. 607 00:43:24,351 --> 00:43:25,771 -Not a bad catch, huh? 608 00:43:25,978 --> 00:43:27,188 It's an amazing catch, man. 609 00:43:27,980 --> 00:43:29,400 It smells good, looks good. 610 00:43:29,732 --> 00:43:32,482 But, you know, I'd have been happy eating vegetables right now 611 00:43:32,568 --> 00:43:34,238 -if that's all we had. -I know. 612 00:43:35,404 --> 00:43:36,414 Boom! 613 00:43:36,488 --> 00:43:39,988 There's all this anticipation and buildup, it almost felt guilty 614 00:43:40,117 --> 00:43:43,287 or like I was doing something wrong if I was gonna take that first bite. 615 00:43:46,707 --> 00:43:49,627 This will be the nicest "break-fast" I've ever had, I think. 616 00:43:52,546 --> 00:43:54,876 -So who eats first? -The man who caught the fish. 617 00:43:56,175 --> 00:43:58,755 We didn't dive into it like we'd expected. 618 00:44:00,220 --> 00:44:01,220 It's unreal. 619 00:44:05,059 --> 00:44:07,349 Ceremonial and... 620 00:44:08,395 --> 00:44:09,555 and important and special. 621 00:44:09,813 --> 00:44:10,903 Mmm. 622 00:44:24,161 --> 00:44:26,461 Don't know whether to laugh or cry. 623 00:44:27,247 --> 00:44:30,497 That was the best meal I've ever had, I think. 624 00:44:32,961 --> 00:44:35,511 Sometimes when I'm eating that first meal after a fast, 625 00:44:35,589 --> 00:44:38,759 I have this tiny, tiny piece of regret. 626 00:44:39,009 --> 00:44:41,429 And I think, "Should I have gone another day?" 627 00:44:41,637 --> 00:44:42,757 Do you feel any of that? 628 00:44:44,098 --> 00:44:47,688 -Not a teeny, tiny piece. -Not that much of it? 629 00:44:47,851 --> 00:44:48,851 -Nothing. No. -No. 630 00:44:48,977 --> 00:44:51,437 Absolutely not. 631 00:44:53,440 --> 00:44:56,610 No, right now, mate, I'm in the middle of heaven. 632 00:45:01,699 --> 00:45:03,329 -Oh! It's amazing. -Mmm. 633 00:45:06,495 --> 00:45:08,905 Mmm. Well, I'd like to make a toast... 634 00:45:10,416 --> 00:45:12,876 to the ocean, for feeding us this fish... 635 00:45:13,752 --> 00:45:17,172 and you, for making me suffer through four days of fasting 636 00:45:17,256 --> 00:45:18,716 to really, really appreciate it. 637 00:45:19,299 --> 00:45:23,009 I'll make a toast to your 90-year-old self and those great-grandchildren 638 00:45:23,095 --> 00:45:25,345 -you're gonna be playing with. -Cheers. 639 00:45:33,856 --> 00:45:39,356 So, that's it, four days, no food. Didn't crack. Would I do it again? 640 00:45:39,778 --> 00:45:43,068 Uh... Can't believe I'm saying this, but yes. 641 00:45:43,741 --> 00:45:46,451 From now on, I do want fasting to be a part of my life. 642 00:45:46,660 --> 00:45:50,330 Oh, oh. Look at us going at it. Yeah! 643 00:45:50,748 --> 00:45:53,878 That's not to say I'm never gonna go out with a bunch of friends. 644 00:45:54,001 --> 00:45:56,461 -It's so hot. 645 00:45:56,670 --> 00:46:01,720 Basically eat everything on the menu, like a starving hound. 646 00:46:02,551 --> 00:46:04,301 -It's so hot! 647 00:46:04,470 --> 00:46:05,800 I'll definitely do that. 648 00:46:52,726 --> 00:46:55,476 I'm just looking at it. I'm just looking. I'm not eating anything.