Going on a crash diet may help you lose weight immediately, but will certainly not do any good for your body, your nutrition, your metabolism, your health or your hunger. It can actually lead to weight gain. Crash diets cause yo-yo weight loss. Yo-yo dieting slows metabolic rate. Your body will store energy instead of burning it and you will actually gain weight.
Instead, change your habits. Remember that metabolism is actually a workout in itself. Feed your body healthier foods and give it a digestive workout! Then get the rest of your body moving with regular exercise.