We live in a society obsessed with fad diets and weight loss. You may even be trying to shed some body fat. Have you ever wondered where fat goes when you lose it? Most of us believe that fat turns into energy and is burned off during exercise or when calories are reduced.
How does your body 'burn' fat?
How fat cells work and why it’s impossible to “burn” them off
Weight loss , in the context of medicine, health, or physical fitness , refers to a reduction of the total body mass , due to a mean loss of fluid, body fat or adipose tissue or lean mass, namely bone mineral deposits, muscle, tendon, and other connective tissue. Weight loss can either occur unintentionally due to malnourishment or an underlying disease or arise from a conscious effort to improve an actual or perceived overweight or obese state. Intentional weight loss is commonly referred to as slimming. Intentional weight loss is the loss of total body mass as a result of efforts to improve fitness and health, or to change appearance through slimming. Weight loss in individuals who are overweight or obese can reduce health risks,  increase fitness,  and may delay the onset of diabetes.
When you lose weight, where does it go?
Despite the plethora of weight loss advice out there, knowing how to lose body fat is still one of your most asked questions as summer approaches. And since it's not as easy as burning more calories than you're consuming, let us chew the fat on weight loss. First, when you lose weight it doesn't necessarily mean you're losing fat— because shed pounds unguided and chances are you've dropped a mixture of water and muscle. And who wants to trim down, while losing functionality, strength and body tone in the process?
Lora A. Sporny, adjunct associate professor of nutrition education at Columbia University, answers. In order to understand the disappearance of body fat, we must enter the world of biochemistry.