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Green Tea for Weight Control

Why Use

Green Tea

Why Do Dieters Use It?*

Some dieters say that green tea promotes weight loss.

What Do the Advocates Say?*

Green tea is a good choice for people on a weight-loss program because it can help them to lead a healthier lifestyle. For example, substituting green tea for coffee with cream and sugar not only saves calories but also supplies a lot of healthful substances, such as polyphenols and flavonoids, that can help improve one’s overall health.

Green tea contains a small amount of caffeine, so it serves as a mild appetite suppressant as well.

*Dieters and weight-management advocates may claim benefits for this supplement based on their personal or professional experience. These are individual opinions and testimonials that may or may not be supported by controlled clinical studies or published scientific articles.

Dosage & Side Effects

Green Tea

How Much Is Usually Taken by Dieters?

Test tube studies suggest that green tea extracts high in catechins may inhibit fat digestion and a preliminary human study found a green tea extract increased calorie burning.1, 2 A preliminary human study found that people taking a green tea extract containing 375 mg per day of total catechins (of which 270 mg per day was epigallocatechin gallate) for three months lost an average of 4.6% of their body weight without dieting.3 Double-blind trials are needed to confirm this effect.

Side Effects

Green tea is generally free of side effects. The most common adverse effects reported from consuming large amounts (several cups per day) of green tea are insomnia, anxiety, and other symptoms caused by the caffeine content in the herb.

An extract of green tea taken by healthy women with a meal inhibited the absorption of non-heme iron (e.g., the form of iron in plant foods) by 26%.4 Frequent use of green tea could, in theory, promote the development of iron deficiency in susceptible individuals.

There have been at least 34 case reports of people developing liver damage (sometimes severe) while consuming weight-loss products that contained concentrated extracts of green tea.5 A cause–effect relationship was not proven, and most of the products contained other ingredients in addition to green tea extract. However, researchers have concluded that green tea extract was the probable cause of liver damage in some of the cases.6 Scientists have cautioned against the use of large amounts, or concentrated extracts, of green tea.

Importantly, liver damage due to green tea extract and EGCG supplementation has been reported. A review of these reports indicates high doses (500–3,000 mg green tea extract or 250–1,800 mg of EGCG taken all at once daily) used for two weeks or longer and most often on an empty stomach are more likely to cause liver injury. While individual, possibly genetic, factors may increase susceptibility, it is suggested those with pre-existing liver disease and obesity may be at greatest risk.7

In addition, there is a case report in which a person developed thrombotic thrombocytopenic purpura (a condition in which a bruising develops as a result of a low platelet count) after consuming a weight-loss product that contained green tea extract for 2 months. Green tea was not proven to be the cause of this problem.8

Interactions with Supplements, Foods, & Other Compounds

At the time of writing, there were no well-known supplement or food interactions with this supplement.

Interactions with Medicines

Certain medicines interact with this supplement.

Types of interactions: Beneficial Adverse Check

Replenish Depleted Nutrients

  • none

Reduce Side Effects

  • none

Support Medicine

  • none

Reduces Effectiveness

  • Cardec DM

    Tannins are a group of unrelated chemicals that give plants an astringent taste. Herbs containing high amounts of tannins may interfere with the absorption of ephedrine or pseudoephedrine taken by mouth. Herbs containing high levels of tannins include green tea, black tea, uva ursi (Arctostaphylos uva-ursi), black walnut (Juglans nigra),red raspberry (Rubus idaeus), oak (Quercus spp.), and witch hazel (Hamamelis virginiana).

  • Nadolol
    In a study of healthy volunteers, ingestion of green tea along with nadolol decreased the absorption of the drug and decreased its blood pressure-lowering effect. Based on this report, people taking nadolol should not consume green tea.
  • Warfarin

    One man taking warfarin and one-half to one gallon of green tea (Camellia sinensis) per day developed signs based on laboratory testing suggesting his blood was too thick because the green tea was blocking the effect of warfarin. Removal of the green tea caused normalization of his blood tests. Those taking green tea and warfarin together should have their blood monitored regularly to avert any problems and should consult with a doctor, healthcare practitioner and/or pharmacist before taking any medication.

Potential Negative Interaction

  • none

Explanation Required

  • none

More Resources

Green Tea


See a list of books, periodicals, and other resources for this and related topics.

PeaceHealth endeavors to provide comprehensive health care information, however some topics in this database describe services and procedures not offered by our providers or within our facilities because they do not comply with, nor are they condoned by, the ethics policies of our organization.