Your mother's orders to "eat your spinach" may have done you more good than you know. I've read that the greener a vegetables is, the higher it's cholorophyll level, and that also means higher level of the pigments known as carotenoids, which are thought to protect against cancer.

Thay say that a mix of different colours is the best you can do so a salad that contains red tomatoes, green lettuce, orange and yellow peppers and maybe purple radish would be a great mix of vitamins.