sanitation-india-wasteA farmer in Peepli Khera heads into a sugarcane field to defecate, carrying a container of water to rinse with. In his village, north of Delhi, only one family has a toilet.

How often should we go, though? Generally speaking, Demekhina says, healthy individuals defecate between one and three times a day. Food generally stays in the body for 14 to 36 hours, although up ...