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Source: Zhihu.

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The human body usually converts excess heat into glycerides and puts these glycerides into fat cells. The adipose tissue formed by these fat cells constitutes the fat in your stomach and thighs. Want to lose weight, is to consume these glycerides, let them participate in energy supply. The energy supply of glycerides is usually carried out through oxidative metabolism.

In other words, in the process of fat oxidation, carbon dioxide and water will be generated. This is the main metabolic form of fat. We "breathe" and "boo" fat!

How much did you exhale? How much is it to leave the hospital? In 1949, Professor Lifson calculated the proportion of fat metabolism pathway by isotope labeling method: 84% is what you exhale and 16% is what you excrete as water.

Suppose you lose 10 kg of fat, then 8.4 kg is exhaled by you in the form of carbon dioxide, and the remaining 1.6 kg becomes water and is excreted in various forms such as sweat and urine.