The medical experts agreed with doctors who say that people who know they lack a vitamin should take vitamin supplements.

VOA: special.2009.04.21

How much Vitamin A should they have?

他们应该摄入多少维生素A

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Now the fact that people were so reliant on certain foods led to deficiencies of certain nutrients, so people that were dependent on a rice based diet tended to have problems with deficiencies in protein, Vitamin A, and thiamine.

人们过于依赖某些特定的食物,导致了某些营养元素的匮乏,因此,以米饭为主食的人,很可能缺少蛋白质,维生素A和维生素B1

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Each year an estimated two hundred fifty thousand to half a million children go blind from vitamin A deficiency.

VOA: special.2011.03.01

Several years later, researchers discovered the exact cause of pellagra: a lack of the B vitamin known as niacin.

VOA: special.2009.01.27

Several studies have not been able to show that taking vitamin supplements in addition to a balanced diet helps to prevent disease.

VOA: special.2010.09.14

That is,it is better to eat vitamin-rich foods to prevent disease instead of eating them to cure a disease after it has developed.

VOA: special.2009.04.21

They taste good. And they contain a lot of carotene, which the body makes into vitamin A.

VOA: special.2009.02.24

Ultraviolet light from the sun changes a substance in the skin into vitamin D.

VOA: special.2009.04.21

People who do not get enough vitamin A cannot see well in darkness.

VOA: special.2009.04.21

Vitamin A helps prevent skin and other tissues from becoming dry.

VOA: special.2009.04.21

Cabbage is a good source of vitamin C and other nutrients.

VOA: special.2009.03.03

Vitamin A is found in fish liver oil.

VOA: special.2009.04.21

"There have been some studies showing that if you give pregnant women 4,000 units of vitamin D a day, their rates of complications in pregnancy are much decreased."

VOA: standard.2010.05.28

Doctors rarely see these conditions. But studies have linked vitamin D deficiency to a number of serious health problems, including heart disease, several types of cancer, osteoporosis,diabetes, Alzheimer's disease and some autoimmune disorders.

VOA: standard.2010.05.28

"Vitamin D has become a very hot topic in medicine now as we are discovering very high levels of vitamin D deficiency in our population, not only in the U.S.,but worldwide" Vitamin D helps our bodies absorb calcium and helps form and maintain strong bones.

VOA: standard.2010.05.28

"What's very interesting about vitamin D is that it's involved all throughout the body, and it's involved on a local level, so you can have vitamin D active in the breasts, in the prostate,in the colon, and it's thought that the locally-acting vitamin D is helping to protect the body against these cancers, regulating how cells grow and how cells die."

VOA: standard.2010.05.28