You could be eating too quickly. You could be sat badly when you eat, hence your diaphragm going into spasm. You could have a food intolerance. My sister starts burping EVERY time she has eaten anything with potato in. Have a check and see if it really is every time, or only when you eat certain things. make sure you aren't drinking water etc to wash down food, as this can cause hiccups. Eat slowly, chew properly and see what happens. Then you could try eating meals without wheat or dairy and see what happens. Elimination is the best way to find out if you have an intolerance.