Absolutely, we may have a depressed rate of CRC where ultramarathoners just get back up to the historical baseline. Who knows, but we don’t know it isn’t that.
reply"Diseases are not a monolith and you cannot assume low risk of some diseases means low risk of others. That is wild guesswork passed off as logic..."
replyDiseases are not a monolith, but they do tend to arise and fall in some specific clusters, and that is not "logic", good or bad (too many computer-minded people drag logic into the chaos that is biology), but rather a long-time empirical observation, albeit with some exceptions.
Your testicles, empirically, shrink when it gets cold. Do you think measuring their shadow is an acceptable substitute for a thermometer?
replySigh. Sure, if you had a gun to your head and you knew nothing else, it would be better to guess that a given population (hunter-gatherers) with low rates of some illnesses (T2D, HBP) also had low rates of another illness (CRC) than the reverse. Okay. That's a slightly better-than-chance guess, not anywhere near a solid basis for speculation.
reply"Anyways, it makes sense that marathoners get CRC because hunter-gatherers probably don't run that much" is bongcloud lalaland tier guesswork.