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  • Keemun black tea extract reduced food intake and body weight in rats


    Posted by .(JavaScript must be enabled to view this email address)
    Monday, October 10, 2005 9:53 am Email this article
    "Keemun black tea extract significantly reduced food intake, body weight and blood triglyceride of diet-induced obesity rats via oral administration," according to a new study from the Graduate School of Chinese Academy of Sciences in Beijing, China. I don’t know how large the effect was

    I do not have a copy of this paper, so I do not know how much the extract reduced food intake or how much weight loss there was.

     

    INHIBITS FAT PRODUCTION

    Keemun black tea extract inhibits fatty acid synthase more potently than green tea extract

    “The Keemun black tea extract showed more potent inhibitory activity on fatty acid synthase than green tea extract,” according to a new study from the Graduate School of Chinese Academy of Sciences in Beijing, China.

    Theaflavins are the main fatty acid synthase inhibitor in black tea

    The main fatty acid synthase inhibitors in black tea appear to be theaflavins, as opposed to epigallocatechin gallate (EGCG) in green tea.

     

    DEFINTION

    What is fatty acid synthase?

    Fatty acid synthase is the only enzyme that can make fats within the cell; all other fat comes from the diet. (Enzymes are like chemical scissors that are catalysts for biochemical reactions.)

     

    TUMORS

    Fatty acid synthase required for tumor growth

    Fatty acid synthase is required for tumor growth, and blocking this enzyme can prevent growth of tumors according to California Breast Cancer Research Program’s website.

     

    SOLVENT VS WATER FOR EXTRACT

    Solvents produce extract 4-10 times stronger than boling it in water

    The extract from boiling Keemun black tea in water was only one-fourth to one-tenth (10-23 percent) as strong at inhibiting the enzyme as using solvents to obtain the extract.

    This suggests that a commercially prepared extract might be 4 to 10 times stronger than simply making Keemun black tea in boiling water.

     

    WHICH EXTRACT IS BEST?

    Keemun black tea extract not necessarily more potent than green tea extract

    This paper found that Keemun black tea extract is more potent than green tea extract as far as inhibiting fatty acid synthase.

    It also found that Keemun black tea extract reduces food intake and body weight.

    Greeen tea extract and oolong tea extract have other benefits

    Green tea extract and oolong tea extract have other benefits such as increasing the amount of fat that is burned (fat oxidation) and increasing metabolism.

     

    COMBINATION OF EXTRACTS BEST?

    Combination of all three tea extracts may be best

    Therefore, we should not conclude from this study that Keemun black tea extract is better than green tea extract or oolong tea extract as a prevention or treatment for obesity.

    As far as tea extracts, it may be best to take a combination of all three tea extracts: Keemun black tea extract plus green tea extract plus oolong tea extract. They all contribute something to fighting obesity.

     

    QIHONG TEA

    Keemun black tea also called Qihong tea

    Keemun black tea appears to be called Qihong tea according to EnjoyingTea.com.

     

    WHERE TO BUY

    No Keemun black tea extract products at present

    You can buy “keemun black tea”, just do a search on Google, however, it appears that as of right now, there are no products containing “keemun black tea extract”.

    However, I imagine since the publication of this study, companies will begin producing keemun black tea extract in the not-to-distant future.

    REFERENCE

    Du Y, Wang X, Wu X, Tian W. Keemun black tea extract contains potent fatty acid synthase inhibitors and reduces food intake and body weight of rats via oral administration. J Enzyme Inhib Med Chem. 2005 Aug, 20(4):349-56.

    AUTHOR’S CONTACT INFORMATION

    Department of Biology
    Graduate School of Chinese Academy of Sciences
    Beijing, People’s Republic China

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