Production of shit

Is it normal to go a week without shitting? I notice people going to shit everyday. I am thin and eat little food, but people around me eat the same amount and still go to make brown babies everyday. Is fecal production proportionate to metabolism? Is this due to my body being superefficent at stripping useful materials?

>>1
I read in Growlier encyclopedia (1994) that it is normal to shit at least once every four days.  If you're doing that, you're healthy.  Eat more fibre.