[CWIZO]

It'd be surprising if that applies in this context. In the case of the individuals OP mentions, their parents would not have been exposed to ultra processed food (or barely, perhaps only after they've reproduced), so ehatever gens they passed on would not have been adapted. There's simply not enough generations in this case. Especially not for such significant changes.

In any case, it's moot as by and large the westeren diet is not good for the population, exceptions are simply that.

[esseph]

My great grandparents in the US were eating diets of ultra processed foods. Soda Shopes, hot dogs, sausages, hamburgers, Spam, boxed spaghetti, hamburger helper, Jello molds with canned fruit in them, etc.

My great grandfather in particular used to smoke a box of King Edward cigars a week, and lived mostly on a diet of plain bologna sandwiches on plain white bread, and candy corn.