> > But my doctor always says if it looks good and tastes good that I can't have it!
>
> Why IS that? What evolutionary advantage is there to craving foods that will kill you?

It's one of those unfortunate side effects of progress. Having brains that kick in with the "Ooh! Fats and sugars! Give me more!" reflex was a good thing back in the days when you didn't naturally get a lot of them. Since the days of processed food, and sugar being added to absolutely everything*, the average person probably gets triple the amount of fats and sugars their body requires by the time they've smelled the outside of the breakfast cereal box.

*this goes double in the USA. EVERYTHING in the USA tastes like sugar. HOT DOGS taste like sugar. It is a scary, scary country for foreign taste buds.