my 7 year old son has very foul smelling flatulence and has had it for a few years. He eats a fairly healthy diet with fruits, veggies, lean meats, wheat breads and cereals, eggs, nuts , milk... (very rarely fried foods or candy or soda ) No pain associated that we have noticed at all and he s never been diagnosed with any food allergies . If I were to try and determine a food allergy causing this, is dairy the best start, or something easier ? Also, how long should i remove a food before moving onto another to test it?