Fad diets promise quick weight loss, but at what cost. The following are some quick tidbits about some well know fad diets that you need to consider before deciding to make a commitment to one.

Atkins Diet This diet allows you to eat meats high in saturated fat and requires you to cut back on foods full of essential nutrients that are naturally found in fruits, grains and vegetables. To compensate, the diet recommends vitamin and mineral supplementation.

Blood Type Diet Depending on your blood type, you could become deficient in protein or carbohydrates. For example, if you are Type AB, you would essentially become a vegetarian, denying you the nutritional benefits of lean meat such as fish and poultry.

Cabbage Soup Diet This diet is extremely low calorie - less than a 1000 calories - and is deficient in proteins and fats with little micronutrients to show for it. Critics site that much of the weight loss is from water, and therefore is not permanent.

Grapefruit Diet Another calorie restrictive diet, which is primarily how you lose the weight. Versions of the diet sometime let you eat anything you want, while others only require you to eliminate certain foods such as starchy carbohydrates. Researchers have theorized that grapefruit may assist people to lose weight by keeping insulin levels low.

Liquid Diets Liquid diets may incorporate partial or complete meal replacement. As such they may have low intakes of fiber, proteins, fats and other nutrients. They are sometimes used to treat extreme obesity, but they do little in promoting proper nutrition. The most appropriate use of liquid diets are prescribed for those who are going into surgery.

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