real talk:
both our digesting and craving facilities developed in a world without high fructose corn syrup, lil debbie snacks, or pasta. That does not make those things poison. What it does mean is this: our brains love these foods, because they are calorically rich and fatty and sweet. Maybe JL's idea of only eating when you are hungry and eating what you crave would work if you were on a paleo diet. In my world/body, what that would mean was PIZZA EVERY NIGHT, WITH A LIL DEBBIE CHASER. These foods are like nothing our ancestors could have imagined, which means that our dumb brains LOVE THEM and want to eat them whenever we can. Of course our cave-dwelling ancestors would have loved to eat some pizza. They would also have loved to have big guns so they could rape/pillage/plunder. They also would have loved lowest-common-denominator reality TV shows, would never walk anywhere, and would vote for whoever told them the most comforting lies.
Luckily, we have a few thousand (hundred thousand?) years of culture between us and them. As well as things like science, which tell us that eating pasta carbonara for every meal will kill you.
Also:
Evolution: pro
Free will: anti