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