Weight loss in the early weeks of crash dieting is not, as many people believe, made up mostly of unwanted fat. First you lose those carbohydrates stored in the muscles and liver as glycogen. This is why you feel tired on such a diet and have less strength for lifting and running‘because you are losing muscle power. You will also lose a lot of water, which may make you feel less bloated and appear slimmer, when in fact you are still carrying the same amount of fat on your body.