An MVM supplement should not take the place of a healthful, well-balanced diet, but it will help prevent deficiencies that often arise. People may consume diets that are deficient in one or more nutrients for a variety of reasons. The typical Western diet often provides less than adequate amounts of several essential vitamins and minerals. Weight-loss, pure vegetarian, macrobiotic, and several other diets can also place some people at risk of deficiencies that vary with the type of diet. Aging, some medications, and certain health conditions can effect appetite, which may reduce nutrient intake.