1. You have to.
2. But it's better if you don't.
3. If it tastes good, spit it out.
4. If it tastes like sileage, experts want you to eat it.
5. If it has no fat, it will have calories, and vice versa.
(Corollary: if by some miracle you avoid both fat and calories, there will be a ton of salt.)
6. Living on bread and water used to be the ultimate punishment. Now they want you to give up the bread.