Published scientific studies document that humans who eat the most fruits and vegetables have much lower incidences of health problems. Few people, however, consistently eat enough plant foods to protect against common age-related decline. Consumers take dietary supplements to obtain concentrated doses of some of the beneficial nutrients (such as folic acid) that are found in fruits and vegetables. Commercial multivitamins, however, do not provide all the vital plant components that scientists have found are needed to maintain good health.