We all know about fat, its bad, and we need to lose it to be fit and healthy, right?. Well, not quite. In fact, fat (in the right amount) is essential for leading a healthy life. The problem lies in having too much or too little. That’s where body fat percentage comes in. So what is the truth about body fat, how can we calculate it, and what does it have to do with living healthy and everything else there is to know about body fat.