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Antral gastritis is usually caused by a bacteria called H.pylori. You need to get on a H.pylori eradication kit for cure, as your Doctor advises. Get your blood sugar tested as well. Avoid spicy food, hard, hot food, eat more of yoghurt, curds, buttermilk, fresh fruits and vegetables. Drink plenty of water. Consult your Doctor regarding the right treatment and along with exercise you will be able to feel comfortable and lose weight as well.