Hummingbirds have one of the fastest metabolisms of any animal on the planet. In fact, their metabolisms are over 75 times faster than a human’s and almost 100 times faster than an elephant’s.

The study, which employed a mathematical model of men's and women's metabolisms, showed that men's metabolisms respond better ...

Sarah Carolides says being a fast or slow metabolizer affects how well your body handles caffeine and how much coffee you ...