The condition you are referring to is known as gastroesophageal reflux disease or GERD, also colloquially known as acid reflux for short. Reflux is an abnormal, reverse flow of some fluid, in this case, the backward flow of gastric acid from the stomach into the esophagus. The condition can have any of a number of possible causes, and no single food substance can be adequate to treat it.
Apples are sometimes recommended as a simple and highly effective way to combat acid reflux. Since an apple is always good for health, you can go ahead and see if it works for you. However, even if it does, you will in all probability also need to take a few other steps to handle your problem. Combating acid reflux requires more of lifestyle changes rather than home cures or remedies or consumption of specific foods. There are however things that you should avoid consuming — alcohol, tobacco, coffee, colas and aerated drinks, high fat foods, and cruciferous vegetables. Apart from this you should keep a gap of at least two hours between your meal and bed time. Smaller meals also help — a large meal that fills your stomach to capacity is more likely to cause acid reflux.
answered by M W