1. Metabolism-boosting/calorie-burning pills
At the top of the list of diet scams are pills based on herbal ingredients that promise to boost your metabolism and help you burn calories or fat faster.
Two recent examples of herbal diet pills that caught the attention of the FDA as dangerous are ephedra and kava (Piper methysticum, also known as kava kava).
Until recently, ephedra was found in many herbal dietary supplements for weight loss, but in February 2004, the FDA banned the sale of ephedra in any dietary supplement in the U.S. due to the risk of illness or injury. The herb is a close chemical cousin of methamphetamine or speed and can cause high blood pressure, irregular heartbeat, insomnia, nervousness, tremors, seizures, heart attacks, strokes, and even death.
Kava is a plant found in the islands of the South Pacific. Supplements containing the herbal ingredient are often promoted for relaxation as well as weight loss. But the FDA issued a warning in 2002 that use of supplements containing kava has been linked to severe liver injury.

2. Fat- and carb-blocking pills
Pills that claim to block your body’s absorption of fat and more recently carbohydrates are also commonly-sold diet scams.
Even if these fat and carb blockers worked as they say they do, researchers say the effects can be dangerous if not just plain unpleasant.
It’s like making someone lactose intolerant, says Zanecosky. By making the body unable to breakdown nutrients in the body, which leads to gastrointestinal problems like diarrhea, bloating, and gas, these pills also block the absorption of the vitamins that travel with these nutrients.
“Why would someone purposely submit themselves to that?” says Zanecosky. “Some fat blockers might have something in them that can interfere with how people absorb fat, but they’ve never been shown to help with substantial weight loss.”
3. Weight loss teas
Teas based on herbal ingredients are also touted as diet aids, but researchers say the main ingredient in many of these teas is caffeine, which is a diuretic and leads to water loss.
“Losing water isn’t losing weight,” says Zanecosky. “Caffeine can also increase metabolic rate by a small amount but not enough that you would be able to say that it contributed to weight loss.”
4. Diet patches and jewelry
Patches that deliver drugs though the skin have become popular for helping smokers quit and delivering estrogen to relieve menopausal symptoms.
But experts say no effective weight loss drugs have been designed to be delivered through the skin via patches. Most of the time, these patches contain the same ineffective herbs found in dietary supplements or teas.
Also included in this diet scam category is jewelry, such as earrings or bracelets, designed to be worn on the body with the promise to help people shed pounds. According to the FTC, any claim that people can lose even a pound or more a week using these devices is false.
5. Body wraps or “slim suits”
If there were an “oldie but goodie” diet scam prize winner, experts say it would likely go to body wraps.
The thick, layered sweat suits once popular decades ago have morphed into silver “slim suits” and fat-melting body wraps designed to lock body heat in and melt away the pounds.
But researchers say the only type of weight loss caused by wearing these outfits is water loss caused by excessive sweating. As soon as you take a drink, you’ll gain all that water weight back.

Tags: Diet scams, Weight lossVia WebMD

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