VOA慢速英语 维他命:维持健康的保障

　　Vitamin B-twelve is found in green leafy vegetables and other foods, like legumes and citrus fruits. In some countries, it is added to products like bread.

　　VOICE ONE:

　　In two thousand three, Japanese researchers identified a new member of the B-vitamin group. It is a substance known as pyrroloquinoline quinone or PQQ.

　　The researchers found that PQQ is important in the reproductive and defense systems of mice. They said the substance is similarly important for people. PQQ is found in fermented soybeans and also in parsley, green tea, green peppers and kiwi fruit.

　　VOICE TWO:

　　Vitamin C is needed for strong bones and teeth, and for healthy blood passages. It also helps wounds heal quickly. The body stores little vitamin C. So we must get it every day in foods such as citrus fruits, tomatoes and uncooked cabbage.

　　Vitamin D increases levels of the element calcium in the blood. Calcium is needed for nerve and muscle cells to work normally. It also is needed to build strong bones.

　　VOICE ONE:

　　Vitamin D prevents the children's bone disease rickets. Ultraviolet light from the sun changes a substance in the skin into vitamin D. Fish liver oil also contains vitamin D. In some countries, milk producers add vitamin D to milk so children will get enough.