The main cause of excessive gas is what we eat, so if want to reduce excessive gas and get rid from this embarrassing problem then the first thing which we should do is to change our daily diet.
Apple, broccoli, onions, cheese and ice cream are the main culprits in this category and they should be avoided if we want to get rid of this problem. On intervals these foods should be consumed to fulfill our nutrients need but otherwise it should be ignored.
Another thing which should become your habit is drinking water before having lunch or dinner, this will also help in reducing the gas problem. But eat & drink slowly because it has been observed that many people swallow air while eating and drinking which increases the problem.
Digestive enzymes are also helpful to counter the problem, this is extracted from natural products and has no side effects if consumed within limits.