Saw this on the Net just a moment ago:

"Statement: You should poop at least once a day.

Fact: A half-truth. Regular bowel movements prevent discomfort and constipation, but a perfectly healthy person may not move their bowels every day. Constipation is defined as having fewer than three stools per week."

my parents have always insisted that i go toilet everyday to release "toxins"... guess that is a myth