What Causes Passing Of Gas While Having Healthy Diet To Reduce Belly Fat?

Okay I m 50 five feet eleven and weight 217.8 pounds and I have the big belly. I am a chef. Im over weight and for the last week I have changed my diet and have lost 7 pounds. I just don t no what diet plan should I go on if any. I now snack in fresh fruit during meals and no longer eat pasta or pizza or drink pop. Breakfast is either an organic cereal or two eggs and rye toast. Lunch home made soup. Supper while wheat pita and either roast beef, turkey, or chicken breast on it along with a little sauce and veggies plus a little mozzarella. Occasionally I ll eat a salad. Lately I ve been having way more gas and is this normal from a diet change?