I am a 71 year old female and have had gas and diahrea problems for many years. These problems happen unexpectedly sometimes with bowel incontinence. I am attempting to find out what food causes the problem. I have decided to cut out diary products, coffee, and chocolate. I binge eat and also eat junk foods. I eat very few fruits and vegetables. I drink many carbonated drinks. What do I need to do first to solve the problem?