Therefore, exercise consumes energy, which can consume fat as the main energy supply substance. The energy supply ratio of fat in aerobic exercise is relatively high, so doing aerobic exercise can consume fat well, and then reduce the intake of fat, so that it has no synthetic and stored raw materials, and moderately reduce the intake of carbohydrates, so that it does not have enough raw materials to transform, and finally achieve the goal of reducing body fat.
Extended data
Fat is mainly digested in the upper part of the small intestine, and is decomposed into glycerol, fatty acids and so on by various enzymes and bile salts. There are two kinds of lipid absorption: triglycerides composed of medium-chain and short-chain fatty acids can be absorbed after emulsification and enter the blood through portal vein; Triglycerides composed of long-chain fatty acids combine with apolipoprotein cholesterol to form chylomicrons, which eventually enter the blood through lymph.
After fat absorption, the biochemical process of metabolism in the body is mainly divided into four lipid substances: triglycerides, phospholipids, cholesterol and plasma lipoproteins, which are complicated and precisely controlled by the activities of insulin, glucagon, diet, nutrition and biochemical enzymes in the body and converted into substances needed for various fine biochemical reactions in the body.
Liver, adipose tissue and small intestine are important places to synthesize fat, and the liver has the strongest synthesis ability. After synthesis, it should be combined with apolipoprotein and cholesterol. To form very low density lipoprotein (VLDL), which will be transported to extrahepatic tissues for storage or utilization. If the triglycerides synthesized by the liver cannot be transported in time, fatty liver will be formed.
Long-term hunger, insufficient sugar supply, a large number of fatty acids are used to produce acetyl coenzyme A oxidation energy, and a large number of ketone bodies are produced. The liver is the organ that produces ketone bodies, but ketone bodies cannot be used. Brain tissue can't use fatty acids, but ketone bodies are soluble in water and have small molecules, which can pass through the blood-brain barrier.
In patients with severe diabetes, glucose can not be effectively utilized, and fatty acids are converted into a large number of ketone bodies, which exceeds the utilization capacity of extrahepatic tissues, resulting in an increase in ketone bodies in the blood and ketoacidosis.
Refer to Baidu Encyclopedia-Fat Metabolism