Bloating may be caused by an increase in gas production due to eating foods that contain FODMAPs, but most people with bloating do not have an increase in intestinal gas. What they do have is an increase in intestinal sensitivity (a sensitive gut) and a change in abdominal posture,descent of the diaphragm and relaxation of the muscles of the abdominal wall that causes the abdomen to protrude, both of which may be related to tiredness and an increase in emotional tension.