Fasting means to not eat any food. It is often used as a way to lose weight. Fasting and very low calorie diets are unhealthy and dangerous ways to lose weight. The primary reason is that besides some fat and water, valuable muscle tissue is lost as well. This slows down metabolism. Fasting and very low calorie diets, such as liquid diets, that are not medically supervised do not supplement the body's nutrient requirements to function properly.

Both approaches to weight loss may promote rapid weight loss, but not permanent fat loss. They are associated with medical problems including sensitivity to cold, brittle nails, fatigue, diarrhea or constipation, and heart problems. Weight loss by means of liquid diets can cause gallbladder problems. Sudden death may occur with very low calorie liquid diets or total fasting.

Advertisements using celebrities to promote meal replacement drinks have been widely used in the past few years. Today, however, such products are losing popularity. This is due to the fact that permanent fat loss does not occur unless the person adopts appropriate habits of diet and exercise into their lifestyle.

Medically supervised fasting or liquid diets contain high quality protein and carbohydrates. They are supplemented with vitamins, minerals and electrolytes. With careful supervision, weight loss can be accomplished safely. Such programs require careful medical screening. They may cost around $2000 to $3000.

Diet clinics may offer food plans of 1000 to 1500 calories per day. Some require you to purchase specially packaged meals available only through the company. The cost of these programs range from $250-$1000 or more. Low price initial sign-on offers may not include all costs. These programs provide variable amounts of exercise and behavior modification counseling, which is essential information needed to maintain weight loss.

Remember, permanent fat loss is achieved by following a sound plan that includes exercise, behavior modifications, and a nutritious diet.

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