> there is no reason why any food we made ourselves is likely to be worse for our evolved body than any food that was around when the digestive system evolved
Of course there is. Take an organism, throw it into a random environment. Chances are that it's not going to do as well as it would in the one that it's evolved for.
That's essentially what we're doing when we eat a modern diet - sugar, starch, wheat, beans, etc. are not what we ate when we were hunter-gatherers. It's not particularly surprising that it causes lots of weird and/or bad side-effects.
Of course there is. Take an organism, throw it into a random environment. Chances are that it's not going to do as well as it would in the one that it's evolved for.
That's essentially what we're doing when we eat a modern diet - sugar, starch, wheat, beans, etc. are not what we ate when we were hunter-gatherers. It's not particularly surprising that it causes lots of weird and/or bad side-effects.