Where does fat go when we loose weight?

When we loose weight, where does the fat go? This is an interesting question and something that people are unaware off.

Let’s first talk about fat (for full analysis check out my breakdown of fat blog post) as an energy source. It provides us with 9 kcal per gram that we consume, any excess is stored and consequently you put on the pounds and our jeans get tighter!

The British Medical Journal has recently reviewed what happens to our fat when we loose it. They discussed how simply the food input and output equation firstly, meaning if you consume more than you burn off you put on weight and conversely if you do not consume the amount of calories your body needs it converts our reverse fat stores as a source of energy and we loose weight. There is also the energy input and output to consider, if you run a 10k run and you haven’t consumed enough calories that day your body will use it stores of fat. Simply you increase energy output or lower energy input such that the body dips into its energy storage within fat cells to keep itself going.

So most people assume you would excrete fat but roughly you only loose 15% through water excretion, your fat is actually converted to carbon dioxide and you breathe out the fat you have lost!  YES BREATHING! The article by the British Medical Journal reported when somebody loses 10 kg of fat, 8.4 kg is exhaled as CO2 while the remaining 1.6 kg is lost as water in urine, feces, sweat, tears and other bodily fluids.

So what happens to the cells once you loose weight? They are filled with some other body function and this is why it is easy to put weight back on if your lifestyle deteriorates again. People often say that they are on holiday or just one more treat when in fact the larger you get the more cells you have that remember this and you can easily get back to the size you were. If a lady drops down to a size 8 from a size 16 she has all those cells remembering, this is why I do not recommend doing extreme diets such as shakes, detox tea bags etc because as soon as you eat the stuff you have cut out you will put on weight.

My top tip is to try and loose weight slowly try and aim for 2lbs a week and this gradual decrease will mean you are more likely to keep it off!