Dr Benjamin Caballero, a member of the Food and Nutrition Board at the US National Academy of Sciences, said that for some supplements, including vitamin A, the difference between the recommended dose that could lead to disease like osteoporosis (bone disease) was not large. Popular multivitamins, he added, often contain what could be risky dose.

　　Similar questions are being raised about other vitamins and minerals, particularly iron and vitamins E and C.

　　Researchers say the questions involve multivitamins taken by healthy people, not specific vitamins or minerals taken by groups with special needs.

　　Some elderly people, for example, may be lack of B12 because they lose their ability to absorb it from foods.

　　People who spend little time outdoors may require vitamin D, which the skin makes when it is exposed to sunlight. Even when older people are in the sun, aging skin loses much of its ability to create the vitamin.

　　“If you eat junk food every day, vitamins are the least of your problems,” said Dr Caballero. “You cannot replace a healthy diet. People are looking for the magic bullet which doesn’t exist.”

　　We can infer from the text that _______. A. parents should prevent their children from taking vitamins B. doctors shouldn’t use any vitamins on their patients C. vitamins only increase their risk of disease D. vitamins should be taken with care

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