My answer is suitable for ordinary people to understand.

Fat is formed by excess energy. If you eat food, fat, sugar, protein can't be used up, it will form fat and be stored. Fat is a way of energy existence, just as bank deposit is a way of wealth.

Under normal circumstances, 75% of human energy supply comes from sugar, 65,438+05% from protein and 65,438+00% from fat. The storage and decomposition of fat is slow and complicated.

100 g of fat has an energy of about 900 calories.

The human body only uses the stored protein after running out of sugar. Protein will not decompose indefinitely. When excess protein is decomposed, it will begin to decompose fat. What you want to know is when sugar and protein will be used up, right?

Sugar is stored as glycogen. After eating for about 65,438+00 hours, the glycogen in the body was basically eliminated. At this time, protein and protein mainly depend on the structure of the human body. Some people don't exercise, but their muscles look strong (in fact, they are not). At this time, they will decompose protein to replenish energy. In fact, at this time, they are already preparing to decompose fat. Lipolysis requires dozens of enzymes to decompose amino acids produced by protein in protein's time. On the one hand, it is used to decompose to produce energy, on the other hand, it is used to synthesize these enzymes. When these enzymes appear, fat begins to mobilize, and the energy generated by fat mobilization is high enough to supply all human needs. If a person needs 2500 calories a day, he only needs 300 grams of fat.

If you still don't eat at this time, this energy channel will be maintained, and the attempt of enzyme will not change and may increase. Only when the blood sugar goes up, the human body finds that there is sugar supply, the concentration of lipolytic enzymes will decrease, and lipolysis will slow down. When the sugar supply is sufficient, the fat will be converted from decomposition to synthesis again.

To sum up, the decrease of blood sugar is the only cause of fat decomposition, but on the other hand, the decrease of blood sugar will form hunger. It's easy to break down the fat by crushing the grain. Once this channel is opened, it will become easier and easier to decompose fat in the future.

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