Hollywood actress Cameron Diaz keeps her diet real and doesn't believe in quick fixes. You can learn more about staying fit by flipping through pages of her book 'The Body Book: The Law of Hunger the Science of Strength and Other Ways to Love Your Amazing Body'. People.com shares interesting tips from the star's book: * Drink water when you wake up: Diaz fills a large glass bottle with water before bed and leaves it ready to go. In the morning after she brushes her teeth she finishes the whole bottle. 'Once I drink the water I feel it immediately.