Don't swallow that which the body wants to expell otherwise it will continue.
If it happens after you eat then it is most likely connected to what you are eating. Foods that would cause this problem would be all grains especially the ones containing gluten, all dairy products, peanuts, eggs, meats, and fermented products.
Try eating a meal of only fruits and veggies such as a salad(lemon and olive oil as the dressing only) and as much fruit as you like. If it doesn't happen then you know how to correct the problem.