Carotene is comprised of two isomers, with beta-carotene best known as the most common form. Found in yellow, orange, and green leafy fruits and vegetables, train yourself to shop the outer rims of grocery stores (the produce, dairy, meat and cheese aisles) verus the inner aisles stuffed full of high caloric goodies. In the produce section look for carrots, spinach, lettuce, tomatoes, sweet potatoes, broccoli, cantaloupe, orange, and winter squash. Check your produce for color. The more intense the fruit or vegetable color, as a rule, the greater the concentration of beta-carotene.