Why do i feel gassy or bloated when i eat bread?

Intolerance or more?: Gluten intolerance (about 10% of people) may cause bloating, diarrhea, nonspecific complaints. Celiac disease, among its many manifestations may result in diarrhea. In the latter, exposure of intestine to gluten causes inflammation of affected gut lining, with a decrease in absorptive surface of that gut, & resulting malabsorption of food--best & most enduring fix being to avoid eating gluten.