4. Owning the evolutionary ability to digest starches doesn’t preclude potentially having to forego carbohydrates for health improvement if a lifetime modern foodstuffs have disabled your physiological function.
I think this is a key point worth making. Of course, one could make the reverse point, that while we have ability to exist and be healthy without any dietary carbohydrate, that does not mean that we should. In either case, we have to accept that what works for one person's physiology (and psychology) may not work for someone else. Using any person or group of people as an inflexible standard will always leave some people wanting, regardless of whether our example is our grandparents, an accomplished athlete, or a group of people who lived 150,000 years ago. As
@Marc pointed out, there is a certain degree of population dependent development that we see, which means that someone’s ancestry makes a difference in how well the do with different dietary approaches. As
@Al Ciampa indicated, these genetic predispositions can then be heavily, even permanently, modified by one’s environment, starting at day 1 of conception.
I feel a general sense of exasperation when faced with someone suggesting that everyone should go to one kind of diet, regardless of what that diet is. With all the different variables that can come into play, the only things that really matters are 1) Is it safe? and 2) Am I getting the results I want? My experiences may be valuable for getting someone else off on the right foot, but their own experience is the only standard that really matters. Again, assuming it’s safe. I can confidently state that the Pop Tart and Adderall diet is a bad idea