Vitamins are a group of substances（物质）found in food. The body needs them for life and health. So usually, many people care for the question: am I getting enough vitamins, and am I getting the right kind?
Even though very small amounts of each vitamin are enough for the needs of the body, the worry people have about vitamins has some reasons. And this has to do with their __1_ --- the food they take in. A person eating a good variety of food get all the vitamins now __2 ___ (know) to be needed.
The problem is that there are many people who don’t ___3_ __ foods wisely. So the answer ___4 ___ this question is: No extra ___5_ __ are needed, ___6 __ you eat proper foods. In fact, many of the vitamins cannot be ___7_ __（store） in the body, so when extra vitamins are taken in, the body simply gets rid of them. It is even ___8 ___ (harm) to put too much of certain vitamins into the body. This has been found to be ___9 (truth) of vitamin A and D, when ___10 ___ amounts are taken in.