0:00 The rate at which a yeast cell produces molecular damage is seven orders of magnitude faster than in a human.0:07 That's a factor of ten million.0:09 Wow.0:09 It's one of those facts that just scrambles your brain, and it perfectly sets up the kind of debate we love here on Clash of Geniuses.0:18 So, the big one today: Is aging a program your genes are running, or is it just your body breaking down from accumulated damage?0:26 I mean, it’s the fundamental question, right?0:29 And for me, it has to be a program.0:31 Why does a mayfly live for a day, a dog for fifteen years, and a human for eighty?0:37 It’s not because the mayfly is just...0:39 unluckier.0:40 It's in the code.0:41 Okay, but that's the classic view.0:43 The newest data is pushing back on that.0:46 A huge study in Nature Aging this year found that the single strongest predictor of lifespan across all those species is the rate of damage production.0:56 It's not a program, it's just...0:58 messy chemistry.0:59 Some biological machines produce more garbage, faster.1:02 But what SETS that rate?1:04 That's my point!1:05 That rate is genetically controlled.1:07 You're describing the 'how,' but I'm talking about the 'why.' Look at telomeres, the little caps on our chromosomes.1:15 They shorten with every single cell division.1:18 That isn't random damage, that’s a countdown clock.1:21 That's the textbook example, but the data is getting so shaky.1:25 A 2023 review found telomere length is a really inconsistent predictor of actual health and lifespan.1:32 Some people with short telomeres live long, healthy lives.1:36 It's not a simple clock.1:37 Okay, fair.1:38 It's not simple.1:39 But what about progeria?1:41 The accelerated aging syndromes?1:43 Those are caused by single-gene defects in DNA repair pathways.1:47 The program is broken, so the whole system ages faster.1:51 It always comes back to the genetics controlling the process.1:55 I hear you, but— I think that actually proves my point.1:58 The reason they age faster is because they can't handle the constant, incoming DNA damage.2:04 And we have a perfect, tragic experiment for this: cancer patients treated with genotoxic drugs.2:10 They age decades, biologically, in just a few years.2:14 We are flooding their system with damage, and the result is accelerated aging.2:19 That’s a direct cause and effect.2:21 You’re describing an extreme intervention, not the natural process.2:25 In a normal body, the ability to repair that damage is what matters.2:30 And that ability is programmed.2:32 The program is primary.2:33 It determines the damage rate, the repair rate...2:37 everything.2:37 To say it's just damage is like looking at a computer with a virus and saying the problem is just...2:44 stray electrons.2:45 No, the problem is the bad code!2:47 Okay, but I think the damage theory is just so much more elegant because it's simpler.2:53 It's entropy.2:53 Things fall apart.2:55 We get oxidative stress from things called reactive oxygen species, or ROS, that are just byproducts of living.3:02 They damage our DNA and proteins, and eventually our cells just get gummed up, they become senescent.3:09 See, even there, the story is more complex.3:11 We used to think ROS were pure damage, pure evil.3:15 But now we know they also act as critical signaling molecules.3:19 The body uses the thing you're calling 'damage' to trigger its own protective, programmed responses.3:25 It's not just chaos; it's a regulated system responding to stress.3:30 A regulated system that inevitably fails!3:32 You're describing a fancy, self-destruct program.3:35 I'm describing a machine that wears out.3:38 The end result is the same, but the cause is different.3:42 One is a bug, the other is a feature.3:44 And I'm saying it's a feature!3:46 Evolutionarily, it makes perfect sense to clear out older generations to make way for new ones with fresh genetic adaptations.3:54 A death program can be a survival feature for the species as a whole.3:59 Alright, I'll give you that one.4:01 The line between a program and a system wearing out gets incredibly blurry when the program itself dictates how well the system handles wear and tear.4:11 And the wear and tear is what we actually measure and call 'aging.' You can't really separate them cleanly, which is why we're still arguing about it.4:21 So this is where it gets practical, right?4:23 The implications for research are totally different.4:27 If you're right, and it's a program, then anti-aging research should be looking for a way to edit the code.4:34 Like finding a master switch to flip to make us young again.4:38 Exactly.4:38 You're looking for a way to reset the clock.4:41 It’s a software problem.4:43 But if I'm right, and it's primarily damage accumulation, then the answer is...4:48 uh, maintenance.4:49 Better antioxidants, boosting DNA repair, clearing out those junky senescent cells.4:54 It's about being a better janitor for the body, not a master coder.4:59 And right now, we're funding both, because we honestly don't know which is the better bet.5:05 Or, more likely, we need both.5:07 Which leaves us with the real question, doesn't it?5:10 When we try to fight aging, are we trying to fix a machine that's simply breaking down, or are we trying to hack a program that's designed to end?
