Is sweat fat? Don't pull that.

"Sweat is the tears of fat" is a saying that is likely familiar to many. Quite a few people have also genuinely believed this. During exercise, they refuse to stop until they are drenched in sweat. Now, let's tell you that sweat is just sweat—it has absolutely nothing to do with fat.

To understand whether sweat is fat, let's first explore why people sweat.

The human body maintains a relatively constant temperature, generally around 37°C. If the body temperature rises too high, a person may experience various discomforts. The body temperature is regulated by the temperature control center of the nervous system. When the body temperature increases, the body needs to dissipate heat to maintain a stable temperature. Sweating is one way the body does this. In the summer, when the external temperature rises, the body temperature also increases, and to dissipate heat, the body produces a large amount of sweat. During exercise, people also tend to sweat easily. This is because, during exercise, nutrients in the body produce heat to provide energy, and this process generates heat, which stimulates the regulatory function of the nervous system, activating the heat dissipation mode—sweating.

The sweat we excrete is 98% to 99% water, with the remaining 1% to 2% consisting of small amounts of urea, lactic acid, fatty acids, and other substances. It is clear that the content of fatty acids in sweat is quite low, and saying that sweat is the tears of fat is nothing but a joke.

If fat is not excreted from the body through sweating, then where does the fat people lose during weight loss go? Theoretically speaking, this fat is consumed by the body. For example, when we lose weight through aerobic exercise. After persisting in aerobic exercise for a period of time, in addition to consuming sugar for energy, the body also consumes fat for energy. The exercise consumes the energy provided by this fat, effectively causing this fat to disappear. As for how this fat leaves the body, Professor Brown conducted research on this. Based on the law of conservation of mass, he calculated the weight of the products. The results showed that during weight loss, 84% of the lost fat is excreted through respiration, while the remaining 16% is excreted through urine, sweat, tears, or other bodily fluids. This research was published in the *British Medical Journal*. According to Professor Brown's research, it is more accurate to say that fat is exhaled rather than turning into sweat and flowing away.

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