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> We've been eating bread for millenia According to wikipedia [0]: approximately from 10,000 to 30,000 years ago. Let's take an average reproduction age of 25y and you've got roughly 1000 human generations eating bread. But, also according to wikipedia [1], the oldest Homo Sapiens that we can date range from 200,000 to 300,000 years ago. That's 70-90% of our direct ancestors' natural selection process not having been exposed to bread (widespread grains, in fact). And, if we dare to argue that human metabolism have mainly not changed since Homo Erectus, then we are in another world in terms of comparison, because Wikipedia trace the oldest signs of Erectus as far as 2,000,000 years ago [2], which represent 80,000 generations, and that's ~1% of our ancestors having evolved exposed to grains. So, all in all, "we've been eating bread for millenia" is clearly not all that there is to say on that matter. [0] https://en.wikipedia.org/wiki/History_of_bread
[1] https://en.wikipedia.org/wiki/Early_modern_human
[2] https://en.wikipedia.org/wiki/Homo |