NUTRITION science has identified almost 50 essential nutrients. Nutrients are chemical substances such as vitamins, amino acids, minerals and essential fatty acids, that the human body needs but cannot synthesise itself, and so must be included in the diet.
Scientists have also discovered more than 1,200 phytochemicals, present in fruits, vegetables, beans and grains and animal products. Although not essential, many of these do appear to have a positive impact on health and wellness.