netizens @ strong in the wind_ Muse asked me a puzzling question on Weibo. Her colleague asked her, “mental work is also labor. When physical labor consumes fat, what does mental labor consume?” She answered “probably glucose consumption”, and then her colleague asked, “why can’t I lose weight after consuming glucose?” She was asked.

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actually ask this question. Especially now, review the season of postgraduate entrance examination, many girls are worried because of body fat. On the one hand, they feel that during the review period, they are particularly prone to feel hungry and can’t read books without eating; on the other hand, they feel that they are particularly prone to fat on their stomachs. Why is that? Of course,

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are reasonable. The secret is the brain’s special appetite. The brain and the nervous system as a whole have their own “sweet taste”. They have a strong preference for glucose and rely on it for energy, rather than fat for energy. Once the glucose level in the blood drops below a certain level, the brain will be inefficient, such as hard to focus, slow thinking, drowsiness, just like a student who doesn’t eat in the morning feels like a fourth class in the morning. When the glucose supply is seriously insufficient, the brain will strike, and the feeling is that the eyes are blackened, the consciousness is blurred, and even hypoglycemic coma occurs. Compared with

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, muscles are less picky. Although glucose is also preferred, they are willing to switch their energy sources and rely on fatty acids when glucose levels in the blood decrease. Sprint is the consumption of blood sugar, but because the total amount of blood sugar is very limited, glycogen reserves are not much, need to save for the brain to use, can not let go of the use. Muscle tissue is quite aware of the overall situation, so long-distance running, muscle tissue is always to consume fat. Therefore, as long as you insist on long-distance running, the effect of weight loss is quite good

but what if we are reviewing exams or doing other high-intensity mental activities all day long? The brain requires glucose, and blood sugar must be available. And blood sugar is used by the brain and reduced to a certain extent, the response is hunger, appetite rise. Therefore, when the brain is used intensively, people are more likely to be hungry and want to eat more starchy food or sweets.

you may ask, since the brain has used up glucose, how can you still be fat? The problem with

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is that three meals also contain fat! Because during the review examination, the muscles of the body basically do not exercise, the fat that can be consumed is very, very little. The brain doesn’t use that fat. Therefore, although carbohydrates in food can be consumed, fat is easy to “surplus” down and become fat on the body. The worst case of

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is that the food they eat is hyperglycemic, that is, white and soft starchy food, as well as all kinds of sweets and desserts. They raise blood sugar rapidly, and high blood sugar forces a large amount of insulin to move out. Insulin should have driven a large part of blood glucose into muscle cells, store it as muscle glycogen, or consume it through exercise. However, the muscles of many mental workers are not developed, the amount of exercise is too little, and the ability of muscle to accept glucose is too limited, so a part of blood glucose can only be used to synthesize fat. One of the functions of insulin is to inhibit the decomposition of fat and promote the synthesis of fat. Therefore, people with blood sugar control problems are more likely to be fat and difficult to thin than others, which is also related to this.

I often see this kind of situation in the school: the originally very weak female students, after taking the postgraduate entrance examination, tend to put on a few pounds; those doctoral professors who are busy with meetings all day, busy writing project reports, their stomachs are getting bigger and bigger It’s not surprising, because that’s how it works.

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are also asked by some people: look at the pictures of historical figures, the literati are all fairies and immortals; look at the scholars of the last century, it seems that they are all thin. Why aren’t they fat? Why do many of our scholars and professors have a big belly? In a word, the main difference between us and the ancients is the sufficiency and convenience of food. The ancients did not have processed food, did not open the bag to eat, did not have the gas stove and the microwave oven, did not have the electric rice cooker and the oven. It’s very difficult for them to cook a meal. I’m afraid it takes two hours from ignition to cooking. There is no biscuit cake, no potato chips and no sweet drinks between the two meals Therefore, it would be difficult to eat three meals a day if it wasn’t for the luxurious house life of slaves in the capital city. Even after using one’s mind, it would be easier to feel hungry. There was no snack between the two meals, so we had to carry it. Living such a life, the body is naturally very difficult to get fat. Now that

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already know the truth, it is not too difficult to get away from this obesity, which is caused by more brain and less legs.

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on the one hand, to crack the wrong habits of less exercise, every day to ensure at least half an hour of exercise. After exercise, the blood circulation of the whole body is unblocked, the blood supply to the brain is sufficient, and the problem of drowsiness after meals and the desire to sleep after a brain movement are eliminated. On the contrary, the learning efficiency is higher and the work effect is naturally better.

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on the other hand, to avoid the rapid rise of postprandial blood glucose, so that blood sugar in the normal range, there is no need to worry about insulin troops to send emergency. One of the options is to eat food with slow digestion and low blood glucose response, and replace rice and white flour with whole grains and beans, with plenty of vegetables and a small amount of meat, eggs and milk. The second plan is to eat more than one day, reduce the staple food at three meals, and add a little fruit or yogurt two hours after the meal to make the blood sugar fluctuation more gentle.

students who are anxious to review the exam and white-collar friends who work overtime at the end of the year, may as well try it tomorrow?

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