of carbohydrate stored in your muscles and liver. Each gram of glycogen is bound to about three to four grams of water .
When you severely restrict calories or carbohydrates, your body depletes its glycogen stores, and all that water is flushed out . This is why the number on the scale can drop so quickly. It is mostly water loss, not fat loss.
Health experts are clear on this point: “The initial drop in weight is mostly water and glycogen, not fat.”
The Methods: What People Do for Extreme Weight Loss