Green Coffee For Weight Loss Charushila Biswas Hyderabd040-395603080 May 1, 2019

Green coffee bean extract is the most talked about weight loss supplements in the world. It is the unroasted form of coffee bean that contains a high amount of chlorogenic acid. Research shows that chlorogenic acid inhibits visceral fat accumulation, has anti-inflammatory and cardiovascular protective properties, and increases insulin sensitivity (1). Moreover, green coffee extract has a lesser amount of caffeine as compared to coffee. But the weight loss claims of green coffee extract is highly contested. And any controversial supplement or food can raise curiosity and concern amongst those who want to use it for weight loss. So, I did a little digging to find out if green coffee extract for weight loss is a fact or faux. Read on to know if you should consider consuming it or drop the plan.


What Is Green Coffee Extract?

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The unroasted coffee bean is the green coffee bean. These beans are soaked and concentrated for creating the extract. On the other hand, the coffee that you generally drink is roasted and processed, which is why it looks dark brown in color and has a different aroma. Green coffee extract also tastes much different than coffee. This is the reason why it is not much appealing to coffee enthusiasts. However, green coffee can aid weight loss. Or, is that just a myth? Let’s find out next.

How Does Green Coffee Extract For Weight Loss Work?

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Coffee beans are a great source of two phytochemicals – caffeine and chlorogenic acid. Chlorogenic acid is the one that has weight loss properties. However, roasting the coffee bean can destroy the chlorogenic acid, which is why green coffee extract is suitable for those who want to lose weight. Researchers have found that chlorogenic acid can help improve insulin sensitivity by downregulating the genes responsible for inflammation-induced weight gain and galanin-mediated adipogenesis (2). Chlorogenic acid can also prevent fat absorption and boost fat metabolism in the liver, thereby aiding weight loss (3). Green coffee extract can also help lower blood sugar and keep insulin spikes in check (4). Apart from improving fat metabolism, chlorogenic acid also normalizes the obesity-related hormones (5). Chlorogenic acid has also been found to lower plasma triglyceride and cholesterol levels in mice (6). Finally, chlorogenic acid also helps in weight loss by decreasing the absorption of sugar (7).

So, it is clear from all the studies mentioned above that green coffee bean targets the root causes of weight gain and therefore can be a potential weight loss agent. Green coffee is marketed in various forms. Find out which form of green coffee is convenient for you to drink.

Which Form Of Green Coffee Is Best For Weight Loss?

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Soluble Green Coffee

Simple and quick to prepare, you can enjoy a cup of soluble green coffee just by adding water to a teaspoon of green coffee powder. There are three types of soluble green coffee that are marketed – powdered, freeze dried, and granulated. The powdered coffee is produced by crushing the green coffee beans in hot water under pressure. Freeze-dried green coffee is the best quality soluble green coffee. It is produced by freezing strong coffee infusions and vacuuming to dehydrate the coffee crystals. Granular coffee is created by accumulating coffee powder and using steam to form pellets. Though soluble coffee can be prepared instantly, it has more caffeine content. So, green coffee extract might be a great alternative to soluble coffee. Read the next section to find out more.

Green Coffee Extract

Green coffee extract has the highest amount of Chlorogenic acid and has more nutrients. It is sold in the form of pills or powdered form. The green coffee beans are processed to extract most of the chlorogenic acid. However, you should check with your doctor before buying a pack of green coffee powder or pills for weight loss. Now, the next big question is, how you can lose weight with green coffee? Let’s find out.

How To Use Green Coffee For Weight Loss?

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1. Green Coffee

To prepare green coffee, buy a pack of green coffee beans from the market. Use a coffee grinder to grind the green coffee beans and brew a cup of green coffee. Do not use sugar or artificial sweetener. If you get bored of drinking this, you can add other weight loss ingredients to lose weight quickly.

2. Green Coffee With Mint Leaves

Add mint leaves to your cup of green coffee. Let it steep for 5 minutes, and then drink it. Mint has weight loss properties and will help flush out the toxins.

3. Green Coffee With Cinnamon

Add 1 inch cinnamon stick to a cup of water. Let it steep overnight. Use this water to prepare your green coffee the next morning. Cinnamon helps to regulate blood sugar levels, improves insulin sensitivity, reduces LDL cholesterol, and has anti-inflammatory properties.

4. Green Coffee With Ginger

While you brew your green coffee, add a teaspoon of crushed ginger to it. Do not strain it immediately. Let it steep for 5 minutes and then strain and drink it. Ginger contains gingerol that has a thermic effect on the body. It also helps increase insulin sensitivity.

5. Green Coffee With Turmeric

Though this combination may seem a little odd, it works the best. Add ½ a teaspoon of crushed turmeric root to your coffee and let it steep for 3 minutes. Turmeric aids weight loss by boosting fat metabolism, increasing insulin sensitivity, and reducing inflammation.

As you can see, you do not have to get bored drinking the same old green coffee. But when is the right time to drink it? Find out in the next section.

When Is The Best Time To Drink Green Coffee For Weight Loss?

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  • In the morning, before or after a workout.
  • In the morning, with breakfast.
  • In the afternoon, before lunch.
  • In the evening, with a healthy evening snack.

Green Coffee Dosage

The recommended dosage of chlorogenic acid for weight loss is 200 – 400 mg/day.

But can you drink unlimited cups of green coffee and lose weight? Explained in the next section.

How Many Cups Of Green Coffee Should You Drink For Weight Loss?

Anything in excess can be dangerous. Therefore, limit your green coffee intake to only 3 cups every day. Drinking excess cups of green coffee will not reap any faster results.

Tip – Avoid drinking green coffee immediately after a meal.

But the big question is, is drinking green coffee safe? Let me explain.

Is Drinking Green Coffee Safe?

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The marketed green coffee products by various companies may contain chlorogenic acid and caffeine in different concentrations. Moreover, since supplements do not have to be consistent in terms of composition, low-quality green coffee can be sold in the name of high-quality green coffee. Finally, the caffeine in low-quality green coffee can react with other drugs and supplements that you are currently on. So, before you decide to consume green coffee, do a thorough research and talk to your doctor to find out which is the best brand to opt for. Take a look at the benefits and side effects section before you make up your mind.

Benefits Of Drinking Green Coffee

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  • Boosts metabolism that helps burn the fat.
  • Improves blood circulation.
  • Helps in liver detoxification.
  • Helps to lower bad cholesterol and regulates blood sugar levels.
  • Drinking green coffee can help you feel full for a longer duration, thereby preventing binge eating.
  • Helps improve brain activity that will keep you active through the day.

Now, let’s see what are its side effects.

Side Effects Of Green Coffee

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  • Nausea
  • Headache
  • Insomnia
  • Indigestion
  • Anxiety
  • Depression
  • Increased heart rate
  • Fatigue
  • Loss of calcium and magnesium
  • Ringing ears
  • Can interfere with antidepressants, diabetes, and blood pressure drugs

Now, before you come to a quick conclusion, let’s find out all about the controversy that surrounds this possible weight loss miracle.

Green Coffee For Weight Loss – Fact Or Fiction?

Though a few research papers have proved that green coffee extract can help you lose weight, the Federal Trade Commission, the U.S Senate Subcommittee on Science, and Transportation Committee don’t seem to agree. They argued that the participant size was too small and the experiments were poorly designed. Therefore, even if green coffee shows some signs of weight loss, it cannot be called as the ultimate weight loss supplement. By doing so, the manufacturers are misleading the consumers. In fact, when Dr. Oz talked about this sensational weight loss supplement on his show in 2012, he was criticized and the guest on his show, Lindsey Duncan, was fined $9 million for misleading the viewers with deceptive information that did not have enough scientific backup.

To conclude, losing weight is difficult, but not impossible. If you want to lose weight, you should eat healthy and workout regularly. And if your doctor gives it a thumbs up, you can use weight loss supplements like green coffee extract. But remember, only using green coffee extract to lose weight will not give you any results. Give it a good thought before you start using it. Take care!

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Charushila Biswas

Charushila Biswas is a Senior Content Writer and an ISSA Certified Fitness Nutritionist. She is an alumni of VIT University, Vellore and has worked on transgenic wheat as a part of her Masters dissertation from NRCPB (IARI), New Delhi. After completing her Masters, she developed a passion for nutrition and fitness, which are closely related to human psychology. And that prompted her to author a review article in 2015. She has written over 200 articles on Fitness and Nutrition. In her leisure time, Charushila loves to cook and enjoys mobile photography.

What is the recommended & safe daily dosage of Green Coffee?

Green coffee bean extract has become a popular fat burner due to promising clinical study results as well as media coverage by a famous TV doctor and celebrities such as Mrs. California 2011 Christy Van Der Westhuizen touting its benefits.

In our report we will look into what makes green coffee extract effective, provide the recommended dosage you need for weight loss based on the studies, as well as highlight what you need to look for in a green coffee supplement to stay safe and actually get results.

What is Green Coffee and what makes it effective?

The coffee beans you are used to consuming in your morning coffee have undergone a roasting process in which many properties are lost, whilst others are developed such as taste and texture.

Green coffee contain a unique bioactive substance called chlorogenic acid (CGA), which is extracted and provided in concentrated form in green coffee bean extract (GCBE).

According to WebMD, Chlorogenic acid in green coffee is thought to have health benefits for heart disease, diabetes, weight loss, and others.

Whilst caffeine extracted from coffee has been used for decades for its thermogenic effects, the Chlorogenic Acid found in green coffee extract works on blood sugar levels, helping reduce spikes in blood sugar levels. Which according to early studies may:

  • Lower blood pressure
  • Lower body fat percentage
  • Promote weight loss

You can find out more about how green coffee works in our in depth report here.

What about brewing your own green coffee?

This is a common question we get, and whilst you can purchase green coffee beans, all the studies used concentrated and enriched green coffee extract containing a standardised amount of chlorogenic acid (CGA). As a result, green coffee extract is much more potent and contains a much lower caffeine content.

How about Green Coffee drinks such as Starbucks Refreshers?

Drinks containing green coffee use green coffee beans which are boiled, and the bean infused liquid is then strained and blended with other ingredients including water, flavourings, and sugar to create a refreshing beverage.

This makes for a tasty drink, but the artisanal green coffee extraction process, the lack of chlorogenic acid standardisation, and additional ingredients mean that you are unlikely to get the same concentration as used in the studies. Plus the additional ingredients such as sugar make this more of a tasty once in a while treat rather than a weight loss aid.

How to take Green Coffee extract for optimal results?

Based on the green coffee meta analysis of the most pertinent clinical studies, the optimal dose of Chlorogenic acid is:

200mg of Chlorogenic acid per day, which equates to 445mg of green coffee extract containing 45% chlorogenic acids.


400mg of green coffee extract containing 50% chlorogenic acids per day.

This is the same dosage used in the studies, and the same dosage trainers recommend clients to get optimal results.

Are there any side effects to Green Coffee Extract?

In clinical research, no significant side effects have been reported for green coffee or green coffee extract when it was taken orally at appropriate doses.

Because green coffee contains caffeine, you should avoid taking green coffee if you get side effects when consuming drinks containing caffeine.

Don’t exceed the recommended dosage displayed on your supplement bottle, and If you are under 18, pregnant, breastfeeding or taking any medications, consult a doctor before use.

Which Green Coffee extract is best?

From our initial research we have found that not all green coffee extracts are equal, so to ensure optimal fat loss you need to look for the following:

Your supplement should use genuine green coffee, with a total dosage of at least 445 mg/day standardised to 45% chlorogenic acids (providing 200mg of Chlorogenic acids/day) or using green coffee with a total dosage of at least 400mg/day standardised to 50% chlorogenic acids (providing 200mg of Chlorogenic acids/day).

Any less and you won’t get any results, so look out for any supplements using weaker dosages, or non standardised chlorogenic acid.

Finally ensure your supplement comes from a reputable lab, manufactured to GMP standards.

Following these guidelines will help ensure you get the same dosage as in the studies.

Get the recommended effective dosage of Green Coffee with Better Nutrition Labs

Our Green Coffee supplement features 400mg of premium green coffee extract per vegetarian friendly capsule (taken up to 2 times a day) standardised to 50% chlorogenic acids.

This provides a 400mg daily serving of chlorogenic acid, 2X as much as per the studies, You can find out more about our green coffee supplement here.

Want to take advantage of multiple fat burners? We have recently launched our Garcinia Complex supplement which combines the benefits of Green coffee (225mg of chlorogenic acid) with Garcinia Cambogia as well as synergistic fat burners for even more potent results.

Need more info? Find out more about the science behind Green Coffee in our in-depth report here.

You might think of coffee as your “vice,” but believe it or not studies show that in many instances coffee consumers have a lower risk of several serious diseases compared to non-consumers — whether we’re talking traditional coffee, mushroom coffee, or green coffee bean.

Caffeine found in coffee nutrition has always gotten a bad rap, but research suggests that caffeine’s negative reputation may only be a half-truth. Depending on the quantities consumed, caffeine can have both positive and negative effects. “Stimulant” products containing caffeine can affect the absorption of certain minerals, including magnesium, manganese and potassium, and antioxidants substances. The deep roasting process used to create most commercial coffees reduces the antioxidant content significantly. If you drink one or two cups of coffee per day, you’re probably OK. But when you start drinking more than this, unfortunately your habit is likely to cause high acidity and stressing your adrenal glands.

On the other hand, while caffeine isn’t tolerable by everyone and therefore sometimes should be avoided, there’s growing evidence that consuming coffee and other sources of caffeine moderately — including the product called green coffee bean extract — may be beneficial for weight loss and disease prevention.

Green coffee bean has emerged in recent years as one of the most popular supplements and weight loss products available on the market. Besides helping people shed some excess weight by means of reducing appetite, among other ways, green coffee has been associated with heart health, protection against neurological diseases, and various other anti-aging effects associated with longevity.

Overall there is still some debate over how effective green coffee bean extract is, including some concerns over whether researchers involved in certain studies have been too biased for the conclusions to be reliable. (1) However, at this time there is reasonable evidence to believe that green coffee can have mild to moderate protective effects against many of the biggest health concerns facing us today, similar to some of the benefits of drinking coffee.

What Are Green Coffee Beans?

What is green coffee bean extract exactly, and what makes it different than consuming other coffee products? Green coffee beans, and products labeled as “green coffee bean extract,” come from coffee beans that haven’t been roasted or highly processed. Normally the beans used to make the black/brewed coffee we drink are roasted at 475 degrees Fahrenheit, which changes the bean’s chemical structure, color, aroma, taste and concentration of nutrients. Rather than being brewed into a drink, pure green coffee bean/seed extract is usually taken in a pill form, made from crushed green coffee beans that have higher concentrations of certain nutrients.

Green coffee is a rich source of several types of antioxidants and other beneficial compounds, including a number of polyphenols. One type of polyphenol called chlorogenic acid is found in high amounts in green coffee beans. Chlorogenic acid is considered one of the most beneficial things about consuming coffee beans and the reason that green coffee supplements are said to act as natural weight loss aids and fat burners. Unfortunately, roasting coffee beans removes a portion of the chlorogenic acid found in coffee, which is why consumption of pure/unroasted beans is considered to be superior in a number of ways.

A 2008 study published in the Journal of Nutrition found green coffee bean extract contains three types of chlorogenic and caffeoylquinic acids (CGAs), dicaffeoylquinic acids and antioxidants, including caffeic, ferulic, isoferulic and p-coumaric acid. After giving 10 healthy adults 170 milligrams of green coffee extract, the researchers found that levels of these beneficial compounds were highest between a half hour to eight hours after treatment. The researchers concluded, “This study shows that the major CGA compounds present in green coffee are highly absorbed and metabolized in humans.” (2)

Some research has found that green coffee extract contains about 46 percent chlorogenic acids, along with other hydroxycinnamic acids that are known to have antioxidant health benefits. Together, the total concentration of chlorogenic acid and other hydroxycinnamic acid content is around 57 percent. Caffeine content has been shown to be about 2 percent to 4 percent of most standardized green coffee extract products.

Related: Top 7 Benefits of Green Tea: The No. 1 Anti-Aging Beverage

Caffeine Content of Green Coffee Bean

How much caffeine is in green coffee bean extract?

One cup (eight ounces) of standard brewed coffee has about 95 milligrams of caffeine. Compared to drinking a regular cup of coffee, green coffee bean can have similar amounts of caffeine, but this ultimately depends on the dosage you take — how many capsules taken at once and how many times per day.

Caffeine content of green coffee bean varies from brand to brand, with about 20–50 milligrams of caffeine per capsule. Dosage recommendations also vary, from about two capsules taken once per day up to three capsules taken three times per day. (3) This means if you were to follow recommended dosage instructions for most green coffee bean extract products, you’d ingest about 100–450 milligrams of caffeine daily. This is equal to about one to five cups of regular coffee.

Coffee is of course known to increase alertness and energy due to its caffeine and therefore has effects of the release of certain hormones and neurotransmitters. Is green coffee bean extract considered a “stimulant” then? In most ways, yes. Caffeine is technically a drug and works in similar ways to some stimulating medications when it comes to affecting functions of the the central nervous system. Most consider caffeine to be a type of stimulant of the methylxanthine class. Methylxanthine stimulants, while they are very commonly used by millions of people each and every day, still have direct and sometimes significant actions on parts of the brain and body that control arousal, vigilance, fatigue, anxiety and sleep. (4)

6 Benefits of Green Coffee Bean

1. May Help with Weight or Fat Loss

Green coffee seed first gained popularity when some studies found that it has the ability to help induce weight loss. While it’s certainly not a quick-fix way to reach a healthier weight, research suggests that chlorogenic acid is highly absorbable once consumed and helps the body burn glucose and stored body fat for energy. It may also reduce inflammation (a root cause of diabetes and other metabolic problems), slow the release of sugar into the bloodstream and help regulate the release of insulin, which brings glucose into the cells.

One animal study published in the Asian Pacific Journal of Tropical Medicine that tested the effects of green coffee bean extract (GCBE) on obese mice found that GCBE “significantly decreased body weight gain, liver weight and white adipose tissue weights with regulation of adipose tissue lipolysis hormones, like adiponectin and leptin.” At the end of the study, the mice treated with GCBE had lower fat mass compared to mice that were not given GCBD but were fed the same high-fat diet. Overall, the mice given green coffee bean experienced a relative body weight and fat mass decrease that resulted in the researchers stating that “GCBE has a potential anti-obesity effects.” (5)

2. Can Help Normalize Blood Sugar

Scientists say that the positive effects of green coffee bean on blood sugar has to do with its ability to lower inflammation, aid in reaching a healthier body weight and potentially curb cravings for inflammatory foods. At the same time, it may be helpful for lowering glucose levels and potentially increasing energy. While caffeine may have positive effects on metabolic functions, even green coffee bean products that have been decaffeinated seem to still be beneficial. (6)

Green coffee may be able to help normalize blood sugar levels, sometimes significantly, which in turn can lower the risk of type 2 diabetes. A study published in Evidence-Based Complimentary and Alternative Medicine found evidence that “decaffeinated green coffee bean extract appears to reverse -induced fat accumulation and insulin resistance by downregulating the genes involved in adipogenesis and inflammation in visceral adipose tissue.” (7)

3. May Help Lower Blood Pressure

Many studies have shown that green coffee extract can be effective in lowering blood pressure. A study of 17 hypoglycemic patients revealed that after taking green coffee seed extract, 13 out of the 17 students experienced reductions in blood pressure levels. The participants took about 800 milligrams of extract daily, which is a dose that’s considered on the high side but seems to be very effective in lowering blood pressure. Other research shows that lower doses, between about 50–140 milligrams, may also be beneficial for decreasing blood pressure in adults when taken for four to 12 weeks. (8)

There’s also evidence that chlorogenic acid has hypo-glycemic agents and may positively affect lipid metabolism, resulting in decreases in cholesterol and triglyceride concentrations in the blood. In one study published in the Journal of Nutritional Biochemistry, rats were given green coffee extract for three weeks to test the effects of chlorogenic acid on fasting plasma glucose, plasma and liver triacylglycerols, and cholesterol concentrations. It was found that the extract improved several markers. According to the published report, “Fasting plasma cholesterol and triacylglycerols concentrations significantly decreased by 44% and 58% respectively, as did in liver triacylglycerols concentrations (24%).” (9)

4. Has Anti-Aging Effects Due to Containing Antioxidants

In studies where green coffee bean extract was assessed, many antioxidant properties have been identified that can help slow various effects of aging. As mentioned above, chlorogenic acid is said to be responsible for most of these antioxidant properties of the green coffee bean. While there isn’t a standard recommended intake/value for antioxidant consumption in humans, some experts believe that when a person takes 400 milligrams of green coffee supplements daily (typically broken out into two to three doses), he or she will get a significant portion of the daily antioxidants that a person should aim to obtain from diet.

5. Can Help Improve Energy Levels

Coffee is known to help people feel less tired and increase energy levels because it contains the stimulant caffeine. Caffeine is actually considered a drug and worldwide is the most consumed psychoactive substance there is.

According to the American Psychological Association, caffeine has significant effects on “psychomotor and cognitive performance, psychological well-being, blood pressure, and diagnostic and therapeutic applications, as well as athletic performance.” (10) When you consume a drink containing caffeine or obtain it from taking a stimulating supplement/product like green coffee bean, the caffeine is absorbed into the bloodstream, where it travels into the brain and blocks an inhibitory neurotransmitter called adenosine. (11) At the same time, levels of neurotransmitters called norepinephrine and dopamine increase, leading to changes in cognition, including increased focus, motivation and often positive outlook.

6. Can Help You Focus and Improve Your Mood

As described above, green coffee products contain a decent amount of caffeine, supplying higher levels when you take a larger dose. A large body of research shows that caffeine/coffee consumption is capable of altering many aspects of mental health and brain function, including attention, mood, memory, alertness/vigilance, motivation, test taking, reaction times, motor control/physical performance and more. (12, 13).

However, not every person reacts positively to caffeine’s effects on cognitive function, so always monitor your own symptoms and consider keeping your dose lower to begin with. You also want to avoid caffeine overdose, so don’t overdo it with green coffee bean supplements.

How to Use Green Coffee Beans

Here’s what to look for in a green coffee seed extract product:

  • Make sure the brand you choose only contains pure coffee seed extract and doesn’t contain additives, binders, fillers or cellulose. Organic products are ideal, since this ensures the beans were grown without use of certain chemicals.
  • You can find a pure extract at Amazon or your local health food store.
  • If you have a history of caffeine sensitivity or heart problems (more about this below), consult with your doctor first.

How much green coffee bean should you take? This depends on a number of factors, like your current condition, caffeine tolerance and body weight. Many brands recommend taking an amount in the ballpark of 800 milligrams twice daily (30 minutes before meals) to start.

At this time there is no standard “optimal dosage” for green coffee bean extract. Studies have found that people experience benefits when taking low doses around 200–400 milligrams but may experience even stronger effects when increasing dosage up to 800–3,000 milligrams. Ultimately, the dosage depends on the concentration of chlorogenic acid in your supplement; the higher the concentration of chlorogenic acid, the less you need to take. Recommended intakes range between:

  • When chlorogenic acid concentration is lower (around 10 percent), take 800–3,000 milligrams daily.
  • When chlorogenic acid concentration is higher (around 20 percent), take about 600–1,500 milligrams daily.
  • When chlorogenic acid concentration is up to 50 percent, decrease your dosage to about 200–600 milligrams daily.

Read directions regarding dosage recommendations, being careful not to exceed about 2,000–3,000 milligrams without getting your doctor’s opinion first.

Potential Side Effects of Green Coffee Bean

Although it may certainly have documented benefits, green coffee bean isn’t a miracle product. It’s only a tool to help aid you in your efforts to perhaps lose weight or improve other aspects of health. Keep in mind that while supplements may be helpful, you can also experience significant results simply by changing your diet, decreasing stress, getting enough sleep and regularly exercising (especially HIIT or burst training).

For some people, consuming any source of caffeine, including roasted coffee, can cause side effects, including anxiety and blood pressure problems. For those with a history of caffeine sensitivity or heart problems, it’s important to avoid caffeinated drinks or supplements since this can cause or aggravate heart rhythm abnormalities. If you notice symptoms like IBS, constipation, diarrhea, headaches, sleep problems or acid reflux getting worse when you consume caffeine or take green coffee bean products, then it’s best to stop using them and speak to your doctor about their advice.

People with any of the following conditions should always speak with their doctor before taking caffeinated products in order to make sure there are no risks involved:

  • During pregnancy or when breast-feeding
  • Anxiety disorders
  • Bleeding disorders
  • Diabetes
  • Diarrhea
  • Glaucoma
  • High blood pressure

Final Thoughts on Green Coffee Bean

  • Green coffee bean extract is a supplement made from unroasted, “pure” coffee beans that contains high levels of the protective polyphenol called chlorogenic acid.
  • Some benefits associated with green coffee bean consumption include weight or fat loss, help with normalizing blood sugar and insulin, heart health, increased energy, cognitive health, and improved moods.
  • Those who are easily affected by caffeine or have certain conditions should check with their doctors before consuming too much green coffee bean, as the caffeine can have adverse effects.

Read Next: Fight Cancer & Detoxify with a Coffee Enema

Dr. Oz Tries To Do Science: The Green Coffee Bean Experiment

Coffee beans (Photo credit: Wikipedia)

Dr. Mehmet Oz hosts a popular TV show in which he promotes all sorts of medical treatments, some good and some – well, not so good. And once in a while, he tries to do a science experiment, as he did in 2011 with a badly flawed experiment on arsenic in apple juice.

Well, Dr. Oz has done it again. This time he wanted to re-examine a claim that he himself had made on an earlier show about green coffee bean extract.

In April 2012, Oz aired a segment on his TV show called “Green Coffee Bean Extract: The Fat Burner That Works!” On it he “this miracle pill can burn fat fast, for anyone who wants to lose weight.” Not surprisingly, sales of green coffee bean extract skyrocketed in response.

“A marketing apocalypse was ignited!” Dr. Oz pointed out in his show in September of 2012. “I was surprised by the firestorm,” he said.

Dr. Oz loves this topic, by the way. He’s run dozens of shows on weight-loss gimmicks, such as “The New Silver Bullet for Weight Loss” in which he promoted a new diet pill called Qnexa, and “Ancient Ayurvedic Secrets to Lose Weight”. But let’s leave those for another day.

One problem with Oz’s first green coffee bean show was that he based it on a study that has some serious problems. That study claimed that a particular brand of green coffee bean extract called GCA led to significant weight loss. Subjects lost a lot of weight, too: 8 kilograms (over 17 pounds) on average. Dr. Oz called it “a staggering, newly released study.” Wow, must be good, right?

Let’s look at that study, shall we? First, it only involved 16 people, a tiny sample. There were 3 treatments: high dose GCA, low dose GCA, and placebo. The subjects were divided into 3 even smaller groups, but not by treatment: instead, each group took all 3 treatments, for 6 weeks at a time, with a 2-week rest period in between. The only difference between groups was the order of the treatments (high-dose/low-dose/placebo). Subjects in all 3 groups lost about the same amount of weight. What was the difference? Well, the authors claimed that the amount of weight loss during the periods when the subjects were taking GCA was greater than when they weren’t, even though they lost weight even during placebo treatment.

One critique of the study is there was no proper placebo control. Looking at the paper, it is impossible to tell how much weight loss is being attributed to the green coffee beans rather than the daily monitoring of diet, which is known to help with weight loss. And it’s a really, really small study.

Perhaps a larger problem is that the trial was carried out in India, and then written up by a U.S. researcher, Joe Vinson from the University of Scranton, as revealed by a story in The Globe and Mail (Canada) last December. That’s right: the subjects were recruited in India, all data was collected there, and the data was emailed to Vinson so he could write it up.

Even more troubling was that Vinson was paid by the makers of GCA to write the study. Worse yet, the paper states that “The authors report no conflicts of interest in this work.” When asked about this by The Globe and Mail:

“Vinson said that he doesn’t gain financially if the company sells a lot of product and that the journal didn’t require him to disclose the relationship.”

This small, badly run study was anything but “staggering”, as Dr. Oz called it. I have little confidence that the data sent to Vinson from India was even correct.

Maybe Dr. Oz might was worried too, because a few months after his original show, he ran another show in which he looked at green coffee bean extract again. He said he was responding to criticism of his earlier show, and he wanted to set the record straight. For his second show, “Green Coffee Bean Extract: The Answer to Weight Loss?” he ran his own experiment:

Oz’s experiment involved 100 women – all of them in the studio audience for his show – who took either green coffee bean extract or a placebo pill for two weeks. And the result? I won’t make you watch the video; here is the entire statement of results, from Oz’s website:

“In two weeks, the group of women who took the green coffee bean extract lost, on average, two pounds. However, the group of women who took the placebo lost an average of one pound – possibly because they were more aware of their diet for that two weeks because of the required food journal.”

On the show, Oz stated proudly: “green coffee bean worked for us.”

Maybe Dr. Oz’s science experiment was better than the Vinson study. But that doesn’t mean it was any good. First off, Oz seems to have ignored some critical rules on how to run a experiment involving humans. As Scott Gavura pointed out at the Science-Based Medicine blog, Oz’s study “makes a mockery of good research methodology.” Oz failed to explain how the women were recruited for the experiment, and Gavura points out that apparently did not obtain the ethics board approval that all experiments on human subjects require.

Oz also seems willfully ignorant of the notion that 2 weeks is far too short a time to assess the value of a weight-loss treatment. Will he go back to those same women a few months later to see if the effect lasted? Somehow I doubt it.

But what about that result? The women who took the coffee bean extract lost 2 pounds, versus just 1 pound for the other group. (Actually, thanks to Scott Gavura, we know that the difference was even smaller, just 0.76 pounds.) Oz provides no statistical analysis to demonstrate that is even marginally significant. Nor does he provide the raw data that would allow others to replicate his analysis, as he might have to do if he were actually to try to publish his study. But for Oz, what he described on his show seems to be proof enough. That’s is a poor excuse for science.

Meanwhile, sales of green coffee bean extract continue to climb. My advice: save your money. And the next time Dr. Oz runs a science experiment, be skeptical.

Researchers retract bogus, Dr. Oz-touted study on green coffee bean weight-loss pills

Mehmet Oz — a.k.a. Dr. Oz — testifies before the Senate Commerce Committee in June.
(Reuters) By Abby PhillipAbby Phillip Reporter Bio October 22, 2014

Researchers have retracted a bogus study that was used by a company to validate weight-loss claims for green coffee bean pills, one of several questionable supplements being scrutinized by federal regulators.

The study, which was conducted in India but written by researchers from the University of Scranton in Pennsylvania, initially claimed that people who used the supplement lost 16 percent of their body fat (about about 18 pounds each) with or without diet and exercise.

Now, the paper has been taken down from an open-access scientific journal’s Web site with this message: “The sponsors of the study cannot assure the validity of the data so we, Joe Vinson and Bryan Burnham, are retracting the paper.”

Applied Food Science, the company that marketed the pills, recently settled with the Federal Trade Commission for $3.5 million after regulators looked into the questionable weight-loss claims associated with the product. The FTC raised questions about whether the study that the company’s findings were based on had been based on falsified information — including the weight of participants and the length of the study.

The use of green coffee extract is one of several questionable weight-loss schemes that have been endorsed by syndicated television personality Mehmet Oz, also known as Dr. Oz.

We’ve written in the past that Dr. Oz called the product a “magic” weight-loss product and touted the now-debunked research on his show.

“You may think magic is make believe, but this little bean has scientists saying they found a magic weight loss cure for every body type,” Oz exclaimed in the Green Coffee Extract episode of his show. “This miracle pill can burn fat fast for anyone who wants to lose weight. This is very exciting and it’s breaking news.”

Oz touted the “staggering newly released study” that showed participants lost an “astounding” amount of fat and weight — 17.7 pounds and 16 percent of body fat — by doing absolutely nothing except taking the supplement.

As of this posting, Oz’s Web site has been entirely scrubbed of almost every mention of the green coffee extract, including the episode touting the product and the “independent” experiment he and his show conducted to present their own evidence of the substance’s weight-loss effects. The 2012 episode has also vanished from YouTube due to a “copyright claim by doctoroz.”

In light of the study’s retraction, Dr. Oz has posted a new message on his Web site (although it can be found only if you search for it):

In prior seasons, we covered Green Coffee Extract and its potential as a useful tool for weight loss. Recently the authors of the peer reviewed research paper on which our coverage had been partially based formally retracted their study. While this sometimes happens in scientific research, it indicates that further study is needed regarding any potential benefits of Green Coffee Extract.

In summary: We were wrong about green coffee extract, but that’s science!

The controversy over Oz’s seemingly wild claims about weight-loss products have landed him in front of Congress and caused some problems for people who associate themselves with him.

Based on Oz’s new statement, it’s not clear whether his show is taking a different tack and more responsibly informing his audience about weight loss-strategies that are actually scientifically proven to work.

We’ve reached out to Oz’s office for further comment, and we will update if we hear back.

Green coffee to lose weight

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