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Verdesse, the new A-list diet aid of choice, is a green coffee pill, which is believed to help suppress the appetite as well as encouraging fat burning.

Already believed to be using the pills are Demi Moore, Jennifer Lopez and Katy Perry, while the rest of the Los Angeles glitterati are set to follow suit

Verdesse is made from unripe coffee bean extract, and contains no caffeine – unlike green tea.

Instead, the beans contain chlorogenic acids, including one that happens to be a potent natural fat-buster called 5-caffeoylquinic acid.

“My clients have been going crazy for green coffee bean pills,” a well-respected Hollywood nutritionist revealed in an interview with Grazia.

“They’re taking Tinseltown by storm. In the run-up to the Oscars, actresses do almost anything to look as slender as possible and they’re all fighting it out to have the best body on the red carpet.

“As soon as this pill got a name for itself as being the new miracle weight loss tablet, word spread like wildfire among the Hollywood elite.

“You’re supposed to take 800 mg a day but some are taking 1,600 mg and insisting <<it can’t do any harm>>.”

Although taking double the correct dose isn’t recommended, there is some evidence to support green coffee’s fat-busting reputation.

A study conducted by scientists from the University of Scranton in Pennsylvania found that taking the pills can help boost weight-loss by an impressive 10% – even when taken in relatively low doses.

Joe Vinson, who led the study, said: “Based on our results, taking multiple capsules of green coffee extract a day – while eating a low-fat, healthful diet and exercising regularly – appears to be a safe, effective, inexpensive way to lose weight.”

But not everyone agrees with Joe Vinson, and a significant number of health professionals have come forward to outline the downsides of green coffee bean pills which can include anxiety and high blood pressure.

Verdesse, the new A-list diet aid of choice, is a green coffee pill, which is believed to help suppress the appetite as well as encouraging fat burning

Verdesse, the new A-list diet aid of choice, is a green coffee pill, which is believed to help suppress the appetite as well as encouraging fat burning

“Side effects can include anxiety, high blood pressure and IBS [irritable bowel syndrome],” says Romi Polichino, a London-based nutritionist.

“People have suffered from any of these things, or panic attacks and epilepsy, shouldn’t take them.”

Worse, suppliers outside of Europe and the USA are relatively uncontrolled and some have been found to substitute cheap ephedrine for the expensive coffee extract.

“The quality of these pills can vary,” adds Romi Polichino.

“You can buy them cheaply online but who knows what’s in them? I’ve heard that lots of them have fillers added to bulk them out.”

Banned in the UK, ephedrine is a substance that acts similarly to cocaine when ingested, leaving the user with a racing pulse and making them hyperactive, while also suppressing the appetite.

But even without the potential for ephedrine contamination, nutritionists are concerned that the pills will become popular with women who don’t need to lose weight – and will suffer as a result.

“Women who are already slim shouldn’t be taking these pills,” says Romi Polchino.

“In my view, more rigorous research needs to be carried out before we start putting them in our mouths.”

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Experts have warned that gym supplements are often doing more harm than good.

The British Dietetic Association (BDA) says high levels of additional protein can cause side effects.

These can included nausea as well as kidney and liver damage.

They want clearer warnings about what is in the powders and tablets.

Manufacturers say consumers are well protected with only 11 reported reactions in 11 years.

“The more protein in your diet the more you have to get rid of.”

Experts have warned that gym supplements are often doing more harm than good

Experts have warned that gym supplements are often doing more harm than good

Jane Griffin is a former British Olympic dietician and speaks for the BDA.

“People who have these high protein diets are now running into problems with their kidneys because of the amount of protein they must get rid of.”

The body needs protein for muscle growth and many gym goers use it to try to get bigger quickly.

Gym supplements come under food law so although they have to be labelled properly what is in them can vary.

They are different to medicines which legally have to ensure contents are more specific.

Euromonitor, who research the market size of products, estimate that the sports supplement industry grew 15% last year.

They think one in five people who go to the gym more than twice a week use supplements that can come in the form of powders and bars.

British Department of Health advises adults to avoid consuming more than twice the recommended daily intake of protein (55.5 g for men and 45 g for women).

Most adults will take this in during their normal daily meals.

There have been warnings before, most recently from the food standards agency, who advise people not to take gym supplements containing DMAA.

The stimulant was being sold in some pre-workout and “fat-burning” shakes.

The BDA argue there is now evidence to show excess levels of additional protein taken over a long time can cause health problems.

They believe people can get enough protein naturally from things like chicken and milk.

Richard Cook is 22 and a student from Chesterfield. He has been taking supplements for four years but says he had a bad reaction to one of them.

“It felt like I was on drugs. I was shaking and I got angry. It also had an effect on my girlfriend who didn’t want to be around me when a had taken it.”

Although he still takes protein and creatine gym supplements he says he has cut down from seven to four shakes a day.

“I started thinking to myself, with this one product, why am I taking it when I feel terrible?”

The Health Food Manufacturers’ Association, who represent the supplement industry, says compared to other foods or medicines, gym supplements have an enviable record.