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Mental activity is still less energy-consuming than hard physical work.
Intense psychoemotional stress can increase calorie consumption by 20% of the level of rest energy consumption, as a rule, a person is not in such a nervous state for a long time. It should be understood that emotional activity is more energy-consuming than just mental activity. Now, if someone decides every day to solve logarithms that are not given to him, and gets angry and nervous about it, then his daily energy consumption will be 15% higher than that of his colleague, who mainly cultivates a virtual vkontakte farm.
Physical intensive work requires many times more energy. Moreover, the larger the muscle mass, the more energy it needs, even for the main metabolism.
Must not. The blood supply to the heart and brain is identical, that is, if you solve problems and do not move , you will grow fat. Why? Yes, because the brain will spend its calories, and the muscles will turn the energy received into fat reserves.
It is for the same reason that when you run or walk, thoughts just pop into your head
Mental activity is very low-energy-consuming compared to muscle activity. It's hard for me to understand where this myth came from. Most likely, they compared the energy consumption of individual organs and the brain. The brain comes first. But if you take the energy consumption of muscles, then the brain probably won't make up even one percent. So it's useless to lose weight like this.