The large number of food supplements on the market wrongly give the consumer the impression that sufficient nutrient intake is not possible solely from a diet comprising traditional foods. In principle a balanced, diverse diet supplies a healthy body with all the essential substances. In most cases, the intake of food supplements is therefore unnecessary.
However, there are exceptions to this general rule. An unbalanced or inadequate diet may lead to insufficient intake of essential nutrients. During pregnancy and breastfeeding there is an elevated need for specific nutrients. The intake of essential nutrients by elderly people may also be insufficient, for instance, as a consequence of chewing or swallowing disorders or a loss of appetite. The chronically ill may also have an elevated requirement for essential nutrients. In such cases, dietary supplementation may be necessary or advisable. Whenever a food supplement is used as an additional measure to treat or heal diseases like a chronic gastrointestinal tract disorder, however, this should always be done under medical supervision.
Data on nutrient intake indicate that the intake of a small number of vitamins and minerals like vitamin D, calcium, folic acid and iodine by some groups in the population does not meet the intake recommendations of the German Nutrition Society (DGE). However, this cannot generally be equated to insufficient supply or even a deficiency. In individual cases, however, dietary supplementation may be advisable. For instance, the intake of additional calcium by people who do not consume any dairy products may be considered. For several years now, table salt has been fortified with iodine in order to improve the iodine intake on a broad basis in the population in Germany.
Nevertheless, the best nutritional strategy is still a balanced, diverse diet with plenty of fruit and vegetables. Food supplements do not represent substitutes of equal value.