[header] How to choose functional foods [title] Eat a variety of whole foods. [step] Whole foods are free from additives or other artificial ingredients and have been processed or refined as little as possible. Examples include fresh fruits and vegetables, as well as grains and nuts. 
A healthy, balanced diet includes all of these, with variety being especially important. If you eat enough food that naturally contains all of the nutrients your body needs, you may not need take any additional vitamins or supplements.