For every gram of glycogen your body stores, it also stores 3 grams of water. This means that if you remove carbohydrates from your diet completely, you’ll drop a lot of water weight from your muscle and liver cells. Don’t confuse this for fat loss if you follow a low-carb diet; that initial weight drop is mostly water. This works both ways; if you eat a high-carbohydrate meal, you’ll hold excess water. No need to panic if the scale jumps overnight after a carb-heavy meal.