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Lose 10 Pounds in 10 Days!

Eat as Much as You Want -- and Still Lose Weight!

Drop One Dress Size a Day!

Rapid weight loss can be quick and easy -- if you believe the advertising claims.

Fad diets and weight loss supplements promise a slimmer body in no time. In the U.S. alone, consumers spend $33 billion each year on weight loss products.

Do any of these products really produce rapid weight loss? Are they safe? And what are the risks of such fast weight loss? WebMD took a look at some rapid weight loss claims, as well as the available evidence.

So many marketers promise "fast weight loss" it's difficult to sort through them all.

Most rapid weight loss pitches fall into these categories:

Starvation Diets

Beyonce popularized the so-called "master cleanse" diet: water, lemon juice, maple syrup, and cayenne pepper. Variations of these diets have been around since at least the 1950s. They often also promise "detoxification" through colonics or enemas.

Diet Pills and Supplements

Dozens of diet supplements promise to speed weight loss. Generally, they claim either to block absorption of nutrients, increase metabolism, or burn fat.

Very Low-Calorie Diets (VLCDs)

One proven method of rapid weight loss is the medically supervised very low-calorie diet (VLCD). Most of what is known about rapid weight loss comes from studies of people on these diets.

Creams, Devices, and Magic Voodoo Spells

There seems to be no end to the dubious ideas promoted in the name of rapid weight loss. Most promise to replace diet or exercise.

The U.S. Food and Drug Administration (FDA) does regulate dietary supplements; however, it treats them like foods rather than medications.

The FDA also does not regulate claims made by over-the-counter weight loss products. Unlike drug manufacturers, the makers of supplements dont have to show their products are safe or effective before selling them on the market. This means that dietary supplements do not need approval from FDA before they are marketed.

Aside from the very low-calorie diet and weight loss surgery, no other product, pill, or diet has been proven to safely work for fast weight loss. There are prescription medications for weight loss, although none is intended for rapid weight loss, and there can be side effects.

In any rapid weight loss program, what really burns fat is not a pill or type of food. It's the substantial reduction of calories, combined with exercise.

Rapid weight loss creates physical demands on the body. Possible serious risks include:

Other side effects of rapid weight loss include:

The dangers of rapid weight loss increase with the time spent on the diet. Eating a no-protein diet is particularly risky.

Rapid weight loss diets can have ill effects, but so does obesity. For this reason, very low-calorie diets (VLCDs) are considered a reasonable weight loss option for people with obesity (having a body mass index (BMI) greater than 30) needing rapid weight loss for a specific purpose such as weight loss surgery .

VLCDs are doctor-supervised diets lasting several weeks. The meals are nutritionally balanced, but expensive -- people can end up spending thousands of dollars over time. VLCDs safely produce a loss of 15% to 25% of body weight in 12 weeks. That's for those who finish the program: 25% to half of people don't complete the program. Weight returns when the diet is stopped and happens rapidly; mostexperts say it's best to take a more sustainable approach to weight loss comparable to that of regular diets.

Most people seeking rapid weight loss, though, usually do it on their own. Frequently, it's to achieve a short-term goal, such as fitting into a dress, or looking good at the beach.

Starving yourself is certainly not a good idea. But if you're otherwise healthy, a brief period of extreme calorie restriction isn't likely to hurt you. You should tell your doctor what you're doing, and be sure to include protein in your diet (70 to 100 grams per day). Take a multivitamin, and eat potassium-rich foods (tomatoes, oranges, and bananas).

Also, remember that crash diets rarely help you achieve a sustained, healthy weight. Most people put the pounds right back on.

SOURCES:Gilden Tsai, A. Obesity, August 2006.Saper, R. American Family Physician, Nov. 1, 2004.Federal Trade Commission web site: "Commercial Weight Loss Products and Programs: What Consumers Stand to Gain and Lose" and "Weighing the Evidence in Diet Ads."

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Rapid Weight Loss: Is It Safe? Does It Work?

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