When people are hungry, do they break down fat or protein first?

There are two periods of short-term hunger and long-term hunger.

In the human body, the most important energy substance is sugar, which and protein can be converted into each other, but the conversion of sugar into fat is not reversible. When the human body is in a state of starvation and there is not enough sugar available for metabolism, the first energy substance to act as the main energy substance is from the liver.

Breakdown of glucose.

At the same time, glycerol from lipolysis

A part of the energy is also always provided, but not the main one. When the liver is depleted of glycogen, the new glucose produced from proteins becomes the main source of energy**. In this process, the consumption of protein in the body is greater than the consumption of fat.

However, organisms are inherently preferentially programmed to protect the proteins stored in the body, so they do not always maintain a state where protein consumption is greater than fat consumption. When the state of starvation is maintained for more than three days, the brain and circulatory system.

Cells gradually adapt to the use of ketone bodies from lipolysis as the main energy substance. At this time, the consumption of protein decreases, while the consumption of fat dominates, and the body's need for protein is reduced to one-third of what it needs at the beginning of starvation. And this process will continue as the starvation state continues, until the fat is exhausted.

Decompose fat first, and then break down protein, decomposing fat consumes less water than consuming protein, and obtains more energy than consuming protein. Water is very important, people can last about 12 days without eating, and they can only last for 3 days without drinking water.

Consume glycogen first - consume fat - and finally consume protein (protein is generally not consumed, after all, there is a lot of fat, and protein is consumed, which means that it is dangerous).

When people are hungry, organic matter has an energy supply order: first sugars, then lipids, and finally proteins.

Protein in general does not provide energy.

Sugar is like wood, fat is like hoarded grain, protein is like RMB, people want to heat the first thing is to burn wood, and after burning wood, food will be burned, until the last resort.

In most cases, proteins are broken down directly. Aerobic exercise breaks down fat. However, on the whole, if you can continue to exercise, you will still lose fat.

Answer: Fat first. But not tightly. Here's why.

All activities of the human body consume energy, including energy required by basal metabolism and energy consumed by various activities.

A certain amount of energy is produced during the metabolism of proteins, fats and sugars. When the human body cannot obtain energy from food, it needs to consume the energy produced by the metabolism of the three major substances in the body. Generally speaking, the main function of protein is to make up the main components of various tissues and organs in the body, regulate the secretion of hormones and hormones, etc., and participate in the conversion of energy less than sugars and fats.

In fact, in the process of starvation, all food energy is consumed, a lot of water is consumed, and then fat is consumed. Protein energy is rarely consumed.

But starvation alone is not good for your health, and the effect is not necessarily good, because you will soon run out of energy. The best way to be recognized must be to combine exercise, although you eat more, but as long as you do exercise to consume the energy of the injection, it will consume the energy of body fat. In addition, long-term exercise, metabolism accelerates, just like sitting there, people who exercise often consume higher energy in their basal metabolism.