The human body has an amazing capacity to store energy. Throughout childhood and adolescence, we accumulate a certain number of fat cells (adipose tissue) that will remain relatively constant for the rest of our lives. How many of these cells, you ask? Estimates are anywhere from 20 to 400 BILLION! The size of the fat cells and energy content housed within them can be manipulated, but the number is somewhat set unfortunately. Although we often use “weight loss” and “fat loss” interchangeably when we talk about body transformation goals, the actual processes end up looking quite different in execution - and outcome. Just what is the physiological story of fat, and what should it mean for our transformation journeys? Read on for a full body fat primer with everything you need to know for your fat loss goals.