For every gram of carbohydrate that is stored in your body, 3 to 4 grams of water are also stored. Therefore high-carb diets can lead to an increase in fluid storage. When starting a low-carb/high-protein diet like the Atkins diet for example, the increase of protein will stimulate fluid loss and the low amount of carbs reduce the water storage. You may lose some weight quickly from this diet at first but keep in mind that this is water weight and your fluid losses will stabilize after the first few days. As always, a more balanced diet combined with a solid exercise plan will lead to true fat loss.