You might think it's easy to guess if a person is at risk of becoming overweight or developing diabetes. The behavioral traits are pretty clear – that person might exercise less or eat more. He or she might have high blood pressure, or might have gained weight.
But now there's another place to find evidence of those risk factors: in a person's pee.
Researchers are finding clues about the metabolism in human urine – most recently in more than 2,000 samples kept frozen in the basement of Imperial College, in London.