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Culture War Roundup for the week of April 14, 2025

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A blow to the CICO theory of obesity: Pre-fertilization-origin preservation of brown fat-mediated energy expenditure in humans

In mice, cold environments before pregnancy can "pre-program" fat-burning traits in offspring. Could the same be true for humans?

People conceived in colder months consistently had more active brown fat in adulthood

Cohort 4 explored energy use after eating (DIT). Again, those from the cold-fertilization group burned more calories post-meal. In Cohort 5, the DLW method showed these individuals had higher Total Energy Expenditure in daily life, even after adjusting for physical activity and body composition.

Cohort 2, which included adults of all ages, showed that cold-conceived individuals had lower body mass index, less visceral fat, and smaller waistlines. These benefits were linked to increased brown fat activity, as confirmed by structural equation modeling. Interestingly, in younger participants (Cohort 1: males aged 18–25), BMI differences were minimal, likely because they had not yet experienced age-related fat gain.

A deep dive into weather data found that lower outdoor temperatures and wider day-night temperature swings during the months before conception were the strongest predictors of adult brown fat activity.

I find this noteworthy for three reasons —

  • There’s possibly an easy and natural intervention for obesity. The Japanese neurotically dress for the weather, so how great will the effect be for those who accept the cold? “College woman walking to a party in winter wearing a short dress” was a joke when I went to school, but it was apparently pro-natal. Is it the fluctuation which is most significant? Does it need to be tied with the day-night cycle?

  • This is more evidence that humans are shockingly attuned to specific conditions they evolved in, which should be reverse-engineered to find more potentatial interventions for human flourishing. We are much more animal than we like to admit.

  • How many other “willpower problems” have less to do with willpower and more to do with 2nd and 3rd order effects which are hidden from us, or which compound invisibly? There are probably many more for obesity alone.

As others pointed out, CICO cannot be debunked in so far that thermodynamics is immutably true. It's just different factors can contribute to these variables on either side.

How many other “willpower problems” have less to do with willpower and more to do with 2nd and 3rd order effects which are hidden from us, or which compound invisibly? There are probably many more for obesity alone.

agree. Too many people, including even on the 'HBD side', downplay the role of metabolism in regard to obesity. Consider that having a faster metabolism (or more specifically, a less efficient metabolism) means being able to eat more food without becoming obese, hence less willpower is required.

A thing can be true and be mostly bad advice. CICO is like that. If you get your gas car towed to a mechanic and the mechanic asks "have you tried filling it up with gas? You know you can't just get free energy from nothing. To change an object from at rest to in motion requires a force acting up on that object." You'd probably get a little annoyed. Cars cannot run without some form of energy this is true from a physics perspective, but as a way of diagnosing all car problems it's dog shit. You don't need the physics lesson, you need the engine checked by an expert.

But sometimes there is actually no gas in the car and that mechanic would be right that one time. Sometimes calorie counting works for some people. It just seems to fail for most people as a dieting measure. I tend to think of it as a diet for people who think accounting is fun.

That would be a good analogy if people were lecturing you on CICO while you're bleeding out. You can't fix a broken engine with more gas, you can't fix a broken body with CICO.

But pretty much every case of being overweight can absolutely be solved with CICO. Calorie restriction always works if you actually do it. It's just that 90%+ of people prefer to dump a bottle of sauce on every salad they eat but still count it as 100 calories. Which is very understandable - I also struggle with plenty of things that are 100% willpower issues - but pretending that CICO doesn't apply or even claiming it is wrong is just silly. Even Ozempic is nothing but CICO at its core.

CICO is fine as a physics explanation. I disagree with OP that it can be "debunked".

As dieting advice it is crap. The main failure point of diets is compliance. CICO has terrible compliance rates.

I completely disagree with this framing. Advice that has it's intended effect, if you follow through on it, is good advice.

No it's not. And if it was I have a series of the best advice for various topics:

On sports: you should win

On war: kill anyone that opposes you

On politics: convince everyone you are correct and wield all the power.

That "advice" is basically saying what the end state is without good help on how to get there.

You are completely misstating the point of CICO- it is the fundamental truth of body weight from which all other successes must derive, but it is not a prescription for success. Upthread 07mk has a good description- you have to look at the CI and CO components and make for former smaller than the latter. Whateve strategies work for you to accomplish that goal is your path to success, but denying fundamental truths of physics are not one of them.

What I said above, and elsewhere:

A thing can be true and also bad advice.

Good advice in my opinion helps you achieve a desirable outcome.

CICO often manifests as calorie counting. It's the most straightforward interpretation of CICO. Calorie counting has historically and scientifically been shown to have just about zero impact on dieting and positive health decisions. It works for a tiny minority of people. I called it the diet for people that love accounting.

I don't dispute the physics, I never did. Just like I wouldn't dispute the physics of motion and free energy with a car mechanic. A car mechanic that started lecturing me about physics and the need for fuel would be an asshole and I'd never go to him again. Telling a fat person about CICO is the equivalent of that mechanic.

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