Maybe you're not eating meat today or perhaps planning to avoid various foods that aren't kosher for Passover. (Or you're blissfully eating whatever you want...) People follow a lot of eating guidelines based on all sorts of issues -- religious, ethical or other. There are all kinds of diets: to lose weight, to prevent high blood pressure, to save animals' lives, to kill fruits
. Whatever diet suits your fancy, you might want to check out some of these stories on dietary restrictions and food beliefs.
If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post