Inferior digestion genetics.
Once a day or less should be the norm.
Frequency: “There is no normal when it comes to frequency of bowel movements, only averages” says Bernard Aserkoff, MD, a doctor in the GI Unit at Massachusetts General Hospital in Boston.
It’s average to go once or twice a day, he says, but many people go more, and some go less -- maybe every other day, and or as infrequently as once or twice a week. As long as you feel comfortable, you don’t need to give your BMs much thought.
Thus, up to twice a day is the average norm.