If you decide that Keto is right diet for you likely you will loose a lot of weight the first few days. That weight is mostly water and here is why. When we eat carbs they are broken down into glucose. We store glucose in the liver and muscles in the from glycogen. Every gram of glycogen is stored along with 3 grams of water in our muscle and bound with 2.4 grams of water in the liver. Initially when going Keto glycogen stores are depleted and the free water gets excreted. Also, as ketones pass through the kidneys to the bladder the water concentration increases leading to sodium concentration to increase. In turn excreting water and sodium along with the ketones. The total amount of weight loss varies but on average is about 5 lb. This loss is interpreted as lean weight loss. When on a diet amount of weight loss seems to be measure of success but is it really an accurate measure?