What Exactly is Health Food ?

It really is a shame that we would even need to use the term "health food".
Shouldn't all food be considered healthy ?

The Definition of Health Food :
Health food is used to describe any food that is considered to be healthy, or it can mean specific foods claimed to be especially beneficial to health. "Health food" is not precisely defined by the USDA or the U.S. Food and Drug Administration; Health foods are not necessarily organic foods.

Specific health food claims

A common definition of "health food" is a food that acts like a medicine, providing specific favorable effects on health. Purported examples of health foods include alfalfa or broccoli sprouts, wheat germ, and yogurt. In general, these claims of health benefits have not been evaluated by the FDA. Health foods are sold in health food stores or in the health/organic section of supermarkets.

In the United States, the term is often used for foods that are low in fat and/or sugar, since over consumption of fatty and sugary foods is seen as contributing to the obesity epidemic.