The priority of energy supply is sugar eggs, protein (muscle), and finally fat. So just dieting will not only consume fat, but also consume more muscle. In addition, simply dieting to lose weight and not exercising is easy to rebound.

Because dieting will lose muscle, and muscle consumes more calories than fat, it is common to rebound when the diet returns to normal. Moreover, just dieting to lose weight will reduce the metabolic rate. In addition, due to lack of exercise, the body's muscle content is not high, and there will be a feeling of not being heavy but bloated.

Lipids are the general names of oils, fats and lipids. The fat in food is mainly fat. Generally speaking, liquid at room temperature is called oil, and solid at room temperature is called fat. Fat is composed of three elements, C, H and O. Fat is a triacylglyceride composed of glycerol and fatty acids, in which the molecule of glycerol is relatively simple, but the types and lengths of fatty acids are different.

Fatty acids are divided into three categories: saturated fatty acids, monounsaturated fatty acids and polyunsaturated fatty acids. Fat is soluble in most organic solvents, but insoluble in water. Glycerol C3H5(OOCR) 3 is one or more fatty acids.

Reference: Baidu encyclopedia "Fat"