Because apples are warm fruits.

Eating on an empty stomach is definitely no problem.

It is best to fill your stomach when you are hungry.

If eating apples still hurts, it means it's not because of hunger.

Eat regularly and don't overeat for the time being.

Especially if you are obese, especially if you are normal.

Also, excessive exercise.

As long as the exercise to lose weight is aerobic, it can take 30 to 40 minutes a day.

And it is best to start exercising two hours after meals.

Otherwise, it will do great harm to the stomach.

It may be that you exercise too much, and soon after a meal, it may cause a long-term stomachache.