Some people say I exercise before meals, even if I exercise on an empty stomach? Strictly speaking, this is not an empty stomach, because an empty stomach does not mean whether there is food in the stomach, let alone feeling hungry when it is empty.

The concept of fasting is from the perspective of energy and material metabolism. When the concentration of circulating energy substances in our body decreases, especially when the consumption of sugar substances is obvious, it is called fasting. Fasting is the obvious lack of energy substances, especially sugar, in our body. Blood sugar is at a relatively low level, and stored blood sugar (glycogen) is also consumed in large quantities.

Generally speaking, an empty stomach is only considered as 8- 12 hours without eating. Our most common and typical fasting is when you get up in the morning after a sleep. Of course, you can't say that you get up for dinner at two or three in the middle of the night. Such a situation can't be regarded as an empty stomach.

Will the effect of fasting aerobic fat reduction be better?

Compared with aerobic exercise on an empty stomach, the effect of reducing fat is indeed better, but one thing is not particularly obvious.

When we are on an empty stomach, because the level of sugar available to the body is low, the proportion of fat oxidative combustion during exercise does increase. In other words, the less sugar our bodies can use, the more fat we can use. This is the theoretical root of more effective fat reduction on an empty stomach, and it is also true from some studies. On an empty stomach, because I didn't eat all night, my blood sugar was relatively low, and most of my liver glycogen was used up. If I store less sugar, I will consume more fat.

What are the uses of sugar and fat when the human body uses energy substances? Seesaw effect? That is to say, one substance has a large specific gravity and the other substance has a small specific gravity. Therefore, when our bodies have less sugar available, we will use more fat, and vice versa.

However, when you exercise on an empty stomach, you will get a little more fat oxidation, but not too much. It is true that fasting exercise is more conducive to reducing fat, but it will not be greatly different from non-fasting exercise. So don't blindly pursue fasting aerobic, non-fasting time, as long as the exercise is in place, the fat-reducing effect is still guaranteed.

However, it should be understood that in the later stage of exercise, sugar storage is also less, and fat utilization will also increase. In other words, when you exercise for a long time, you also consume a lot of sugar. At this time, if you continue to exercise, the proportion of fat energy supply will also increase. Therefore, fasting exercise can increase the effect of fat oxidation combustion, and long-term exercise can also be achieved. In addition, the researchers did find that fasting aerobic has a better fat burning effect, but this effect will only appear when the exercise time is short. If the exercise time is long, the proportion of fat oxidation will increase because of the prolonged exercise time, and the advantage of fasting will not be reflected.