Selasa, 04 September 2012

Vitamins in Vegetable

Whether raw, frozen, fresh or cooked, vegetables of all kinds rank among the richest sources of vitamins in our diet, especially vitamins A and C. To get the widest range of vitamins and other nutrients, eat a variety of vegetables in different colors and prepared in different ways.

Vitamin C

Your body needs vitamin C to grow and repair tissues throughout your body. It is essential for everything from wound healing to healthy teeth and gums. All vegetables contain some vitamin C, but the richest sources include bell peppers, chile peppers, sweet potatoes, kale, broccoli, Brussels sprouts, tomatoes and tomato juice, potatoes, winter squash and cauliflower.

Vitamin A

Vegetables contain substances called carotenoids that your body turns into vitamin A, which helps form and maintain healthy bones and soft tissue, mucous membranes and skin. Vitamin A also promotes good vision. Excellent vegetable sources of vitamin A include sweet potatoes, pumpkin and other winter squash, carrots, spinach, turnip greens, kale, mustard greens, collard greens, red peppers, cabbage, bok choy and Brussels sprouts.

Folate

Folate, a B vitamin, aids in cell formation and helps prevent birth defects, and may help protect against heart disease and cancer. Good vegetable sources of folate include asparagus, spinach and other leafy greens, broccoli, green peas, and dried beans and peas such as black-eyed peas, navy and kidney beans, and chickpeas (garbanzos).

Vitamin E

Vitamin E is important to immune function and skin health, and may help protect against illnesses such as heart disease and cancer. Normally, you get most of your vitamin E from oils and nuts, but fruits and vegetables do supply vitamin E in varying amounts. Avocados (technically a fruit, but eaten as a vegetable) are rich in vitamin E. Cooked spinach, asparagus, chickpeas, watercress and broccoli contain smaller amounts of the vitamin.

Vitamin K

Vitamin K plays a vital role in blood clotting and may help maintain strong bones. Green, leafy vegetables such as kale, chard and spinach are rich in vitamin K. According to the National Library of Medicine, vitamin K can interfere with some blood-thinning medications, so if you are on such medications, check with your doctor about whether you should limit your intake of vitamin K-rich vegetables.

Retaining Vitamins

Water-soluble vitamins such as folate and vitamin C leach into cooking water, so raw vegetables tend to contain more of these vitamins. To retain vitamins, cook vegetables by steaming them (on the stovetop or in the microwave with a very small amount of water) or quickly sauteing or stir-frying them in a little oil. Bake potatoes in their skins, or mash boiled potatoes with their cooking liquid to retain vitamin C. Serve boiled vegetables such as beans or greens with their cooking liquid.

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