I don't know the science behind this but I think the squatting is better than sitting. I come from a poor country in south east asia and I don't remember hearing poeple talk about constipation like they do here, it's almost like a norm here, which is sad. The majority of people in my country squat to do their business, except for the wealthier class who can afford to get a "throne" to sit on, I bet they going to start to have some constipation problems in the future as well.