Food is colorful. Some food is green, some food is red, and some is black. Now more and more people like to have black food--black rice, black beans, black grapes. Why do they like black food?
* Black food can make grey hair into black hair.
* Black food is good for the heart. 
* Black food can help children become smart.
* Black food can also help women look young.
Black food is very good, but we need food with different colors. Doctors say that it isn't good to be _ about food. So we had better eat all kinds of food.
_   is good for our health.
red food green food black food Food with different colors