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Why you don't want to eat after exercising

23.04.2018

Those who are actively involved in sports or fitness know that after you give your best on the simulators, you don’t want to eat for a very long time. Obviously, after exercise, some mechanism is activated that suppresses appetite and hunger. But what is this mechanism?

Scientists from the Albert Einstein College of Medicine have suggested that it's all about the increase in body temperature - we warm up quite a lot due to physical activity.

Thermoregulation, like appetite, depends on the hypothalamus, a small area in the brain that controls a variety of physiological processes. Each process has its own group of nerve cells, but maybe the hypothalamic neurons that regulate eating behavior also sense temperature?

Cells that suppress appetite are found in the arcuate nucleus of the hypothalamus; their peculiarity is that they are able to directly feel the hormones and other substances that float in the blood (the brain, as we know, is protected from direct contact with the blood by the blood-brain barrier).

To find out if these neurons can respond to heat, the researchers treated them with the alkaloid capsaicin, which is found in hot peppers and which acts on heat receptors (which is why we feel how the pepper burns). Two-thirds of the cells of the arcuate nucleus felt capsaicin - that is, they have heat receptors and they are active.

From experiments with cells, they moved on to experiments on mice. When the animals were injected with a burning substance directly into the hypothalamus, into the region of these same neurons, the mice lost their appetite for 12 hours - they continued to eat, but ate noticeably less than usual. If heat receptors on neurons were blocked, then capsaicin did not suppress appetite.

When mice were run on a treadmill for 40 minutes, their temperature rose rapidly (including in the zone of the arcuate nucleus of the hypothalamus) and remained elevated for an hour - and mice after "fitness" also ate half as much as mice that did not exercise. But if mice with disabled thermal receptors on neurons ran on a treadmill, then they did not have any changes in their appetite - physical education did not affect their appetite.

That is, the hypothesis was confirmed: brain cells that suppress appetite really respond to heat. (To explain why this is necessary, for example, you can do this: a lot of physical activity happens when you have to run away from someone, and the desire to eat a hearty meal here would be inopportune.)

Most likely, the same mechanism has remained with us, and here you can come up with different options for how to use it to reduce weight. Although what is there to come up with - you just need to go to the gym.

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