First of all, it is necessary to treat and improve the problem of gastritis, and then carry out a fattening diet. If you have gastritis, try to eat less and eat more. The diet should be light, and you can eat more foods with high protein and nutrition.

Get up in the morning and drink a large glass of water (about 400ml) to clear your stomach and detoxify.

Fish, meat, beans, eggs and milk are rich in protein, and all kinds of fruits and vegetables are eaten without being picky about food.

Exercise for an hour every day.

Stay away from junk food. Foods that are too delicate are now classified as junk food because they have no nutrition.

Pay attention to rest and try not to stay up late.

If you are optimistic, you can take Zhen Ji ointment to tonify the spleen and stomach and enhance intestinal absorption.

I hope I can help you, and I wish you success in gaining weight as soon as possible.