Every time you eat some type of food that contains carbohydrates your body goes through a process of breaking down the food and converting its carbs to a type of sugar called glucose.
𝐆𝐥𝐲𝐜𝐨𝐠𝐞𝐧 is the stored form of glucose, produced when blood sugar levels are high (when you have more glucose than your body can use at one time). It is stored in the liver and in the muscles.
While each person loses weight differently of course, the first few weeks of a diet are usually a time of rapid weight loss and most of it is because the pounds consist mainly of water and 𝑔𝑙𝑦𝑐𝑜𝑔𝑒𝑛.