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六级冲刺练习阅读17

　　attitude and improved quality of life. People can have a say in whats going on with their bodies by selecting a healthful diet.

　　Skin. Nowhere do the signs of aging manifest themselves more clearly than in the condition of the skin. When your weight fluctuates, the skin stretches with each up cycle, but it may not completely shrink back to its original size in the down cycle. As a result, the skin may sag.

　　A severely deficient diet can lead to skin disorders, dramatically affecting ones appearance. By the same token, a well-balanced diet with ample supplies of nutrients is thought by many experts to produce a glowing, younger look.

　　Zinc and vitamin A are important for normal, healthy skin. Zinc helps the skin repair itself, and vitamin A aids in keeping skin supple, preventing dryness and helping shed dead cells. Good sources of zinc are beef, eggs and seafood, while many dark-green leafy vegetables are rich in beta carotene, which the body converts to vitamin A. Other foods containing ample amounts of beta carotene include carrots, cantaloupe, winter squash, sweet potatoes, sweet red peppers, apricots and mangoes.

　　Vitamin C helps improve the blood supply to the skin and aids in forming collagen , the fibrous protein that lies beneath the skins surface and gives it a smooth appearance. Good sources of vitamin C include citrus fruits and juices, Brussels sprouts, cauliflower, snow peas, red and green peppers, broccoli, white and sweet potatoes, tomatoes, watermelon, honeydew melon and cantaloupe.