TORONTO — It’s something we all get rid of several times a day — and sometimes in the middle of the night — but it’s not exactly a topic of everyday or, let’s face it, polite conversation. Still, urine, pee — call it what you will — can tell a lot about a person’s health, especially when it comes to colour. Urine is comprised of waste products and excess fluid that are filtered from the blood by the kidneys. When healthy, these twin fist-sized organs filter up to about 150 litres of blood each day, producing one to two litres...