One of the most popular leafy vegetables, used raw in salads and when cooked, loses three fourths of its volume. It's a great source of the vitamins A, C, and K, as well as folate.

This leafy vegetable helps significantly lower risks of osteoporosis; heart disease; colon, ovarian and prostate cancers; and arthritis. Through the combination of beta carotene and vitamins C and K, spinach can reduce the symptoms of asthma and arthritis. The magnesium and riboflavin contained in these wonder leaves can also reduce the frequency of migraines. Spinach is loaded with iron, low-calorie, and totally fat-free!