Popular diets for a given time. "Fad" implies what's in but not necessarily what's "bad." A time restraint is implied, such that a fad diet will soon fade as new concepts become popular.
A major source of energy in the diet. All food fats have 9 calories per gram. Fat helps the body absorb fat-soluble vitamins, such as vitamins A, D, E, and K, and carotenoids.
Some kinds of fats, especially saturated fats, [see definition] may cause blood cholesterol to increase and increase the risk for heart disease. Other fats, such as unsaturated fats [see definition] do not increase blood cholesterol.
Medically, fat is divided into two kinds:
Fats that are in foods are combinations of monounsaturated, polyunsaturated, and saturated fatty acids.
- Healthy -- Example = Omega-3 Oils
- Harmful -- Example = Trans fatty acids