My digestion system is not good from childhood I am facing this problem .I used to go toilet after lunch and dinner .max to Max it takes 2 hour in unloading .I consulted many doctors but still no result .I am underweight and want to put on some weight. What to do to overcome this problem forever? Some points for additional info 1. I don't take any junk food (no oily or dirty street food) 2. No alcoholic or smoker 3.I used to go bed late in the bed around 3 am please suggest some useful tips.