Like fruits, vegetables are one of the best sources of antioxidants available and they can go a long way toward fighting free radicals and slowing the effects of aging. The best vegetables for finding antioxidants are green, leafy vegetables such as spinach and kale. Two of the antioxidants found are lutin and zeaxanthin, which have also been shown to protect against the negative effects of UV exposure [source: Mukhtar].
Vegetables are a fantastic source of vitamins and minerals, including vitamins A, C, K and E. They're also great for the immune system, helping the body fortify itself against sickness and disease. Studies have shown that a diet full of vegetables can help prevent cardiovascular disease, lower high blood pressure and, after a heart attack or stroke, lower cholesterol and unclog arteries. Eating lots of veggies (and fruit) could even reduce the risk of cancer in the digestive tract (including the colon and stomach) by up to 25 percent [source: Klatz].