When you fast, you tend to loose weight-do you loose fat or muscle though?

Question

and why

Answer 1

you lose water

Answer 2

Initially, it's fat. However, when you keep fasting for prolonged periods, your body perceives a state of starvation and will respond accordingly by lowering your metabolic rate. It does this through the down regulation of certain hormones. In addition, because muscle is metabolically "expensive" tissue, the body will try to reduce as much of this as possible so that it expends less energy, thus preserving itself. At this point, you will start losing muscle.

Answer 3

I'm pretty sure when you fast, you will lose your muscles, and they will turn into fat, so actually you gain weight. The right way to lose weight is to eat vegetables and go on a diet, but that doesn't mean you stop eating.

Answer 4

Glucose is the body's primary fuel source, and is essential for the brain's functioning. When denied glucose for more than 4-8 hours, the body will turn to the liver for glycogen, a storage form of glucose, to be used for fuel. A process called glycogenolysis converts glycogen into a usable form of fuel. At this point, the body will also use small amounts of protein to supplement this fuel. This fuel will last for up to 12 hours before the body needs to turn to muscle stores of glycogen, lasting for a few more days.  If glucose is still denied at this point, muscle wasting is prevented by temporarily switching to fat as the fuel source meaning fat is converted into ketone through catabolism. Ketones, while not sugars, are able to be used by the brain as a fuel source as long as glucose is denied.[As a protective biomechanism, many toxins are stored within fat. During catabolism, these toxins are liberated and then released into the blood stream. This increases the likelihood of acetaminophen poisoning, possibly because of depletion of hepatic glutathione reserves. The body will continue to use fat for as long as there is fat to consume. The body will generally indicate to the faster when fat levels are running extremely low (less than 2%) with an increased urge for food. Fasts are usually broken long before this point. If the fast is not broken, starvation will begin to occur, as the body begins to use protein for fuel. It will begin with the least important proteins, then muscles, and eventually organs. Death may occur before the body turns to organs as a fuel source however.

Answer 5

depends. are you just fasting, or are you working out your muscles (weight lifting and such)? Normal fasting is going to make you lose both.

Fasting is NOT the best way to lose weight. Your body goes into starvation mode and hoards any bit of food that you put in to it.

Answer 6

Muscle big time.