As I said in my last note, it's best not to go without oxygen on an empty stomach, because there may be a risk of insufficient sugar, poor exercise performance and hypoglycemia.

But you can take oxygen on an empty stomach, because there are both sugar and fat.

Sisters are advised to understand this picture before they can understand the follow-up content (draw as simply as possible).

2? Changes of aerobic exercise on an empty stomach (Figure 2)

Fasting: In short, the availability of sugar decreases and the availability of fatty acids increases.

Exercise after meals, explain: blood sugar will rise after meals, which will stimulate insulin secretion. The role of insulin is to lower blood sugar, which will drive the increased blood sugar in the blood to the muscles and provide energy for the muscles; While inhibiting lipolysis. Then, the proportion of aerobic exercise using sugar for energy supply is higher.

3? Effect of single aerobic exercise on fasting (Figure 3-4)

This is a small sample experiment, but the experimental design is ok, you can refer to the conclusion.

To sum up, exercise on an empty stomach before breakfast is the same as exercise after lunch and dinner, but the proportion of fat oxidation is higher.

But it should also be noted that this is an experiment of 10 people, and it is a single fasting aerobic, not a long-term one.

4? Summary of the effect of aerobic exercise on an empty stomach (Figure 5)

This article is the summary of my tutor, summarizing many studies, and the conclusion is similar to the last one.

Single fasting aerobic exercise has these effects, which are not clear enough for a long time.

5? Do you want to exercise on an empty stomach (Figure 6)

My personal conclusion is that fat oxidation is higher when you exercise alone or within 24 hours.

But it can't be completely said that long-term fasting aerobic is more conducive to reducing fat.

Personally, I think it is necessary to take oxygen on an empty stomach. In addition to theoretical fat oxidation, we should also consider our own habits, time and preferences.

If you just like to exercise at night, that's fine.