It may prevent hemorrhoids, according to a writer at Slate.
I first heard about this debate around three years ago, probably at Mark’s Daily Apple. You don’t hear about it much now. An article at Huffington Post dredged it up recently. The Post will also tell you 14 other things you’re doing wrong in the bathroom. Take’em with a grain of salt.
I only bring this to your attention in case you’re new to the paleo lifestyle. It’s not just about food, ya know. Modern toilets haven’t been around forever. Billions of us still squat to poop, just like our ancestors.