Anyone who looks for long term results from dieting will not choose a crash diet to achieve results like losing weight etc. A crash diet will give you results for sure, in a shorter time period. However, your body will again start gaining weight and you will be left only with memories of the time when you lost your weight.
A crash diet does not lower the fat from your body. Instead what you lose by following a crash diet is the water. These types of diets restrict your carbohydrates intake to very lower levels. This in turn lowers down the level of glycogen and water in your body. The fat remains untouched and after a while when you will increase the intake of carbohydrates, you will again gain more weight.
Also, these diets are often very restrictive. Sometimes, they cut down a particular component of food to 100%. The thing is that your body needs a balanced diet and if you cut the intake of a particular nutrient then it will be harmful for your body. For example, if a crash diet makes you to avoid fat totally, then your body will develop a system that will store more fat than normal. It will slow down the metabolism of your body, and you will gain more weight due to this.
Crash diets may be very dangerous for the vital parts of your body. They make you lose the lean tissue present around liver, kidneys, brain and heart. If you will starve yourself by following such a diet, your body will break off the muscle tissues, to provide you with sufficient energy.
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