Main reason: he enjoyed the distention of his stomach by gas (carbon dioxide generated by the action of digestive hydrochloric acid on the bicarbonate) and the resultant belching.
Victims of celiaca cannot utilize fats and carbohydrates; most sugars ferment in their intestines, cause enormous distention of the abdomen.
Sometimes women have a spasmodic abdominal distention.
Links 9/17/13 Slow-motion world for small animals BBC. Hah! Time distention! Sometimes I am lucky and get it right before I need to get up.
Sept. 17, 2013 - Naked Capitalism