PMF Findings!

May 12^th 2004… Citrus Peel to Reduce Cholesterol.

A compound found in the peels of citrus fruit has the potential to lower cholesterol more effectively than some prescription drugs, and without side effects, according to a study by US and Canadian researchers!

A joint study by the US Department of Agriculture and KGK Synergize, a Canadian nutraceutical company, identified a class of compounds isolated from orange and tangerine peels and concentrated in citrus pectin that shows promise in animal studies as a potent, natural alternative for lowering LDL cholesterol (so-called 'bad' cholesterol), without the possible side effects, such as liver disease and muscle weakness, of conventional cholesterol-lowering drugs.

The findings, released in today's print issue of the Journal of Agricultural and Food Chemistry, a peer-reviewed publication of the American Chemical Society, the world's largest scientific society, show that the compounds, called polymethoxylated flavones (PMF's), are similar to other plant pigments found in citrus fruits that have been increasingly linked to health benefits, including protection against cancer, heart disease and inflammation.

The study is believed to be the first to show that PMF's can lower cholesterol, the researchers say.

"Our study has shown that PMF's have the most potent cholesterol-lowering effect of any other citrus flavonoid," said Dr Elzbieta Kurowska, lead investigator of the study and vice president of research at KGK Synergize in Ontario, Canada.

"We believe that PMF's have the potential to rival and even beat the cholesterol-lowering effect of some prescription drugs, without the risk of side effects."  PMF's are found in a variety of citrus fruits. The most common citrus PMF's, tangeretin and nobiletin, are found in the peels of tangerines and oranges. They are also found in smaller amounts in the juices of these fruits.

Using hamster models with diet-induced high cholesterol, the researchers showed that feeding them food containing 1 per cent PMFs lowered levels of LDL cholesterol by 32 to 40 per cent.  Previous animal studies by others have shown that similar flavonoids, particularly hesperidin from oranges and naringin from grapefruit, also may have the ability to lower cholesterol, although not as effectively as PMFs, according to Kurowska.

Treatment with PMF's did not appear to have any effect on levels of HDL cholesterol, or good cholesterol, the researcher said. No negative side effects were seen in the animals that were fed the compounds, she added.  The researchers are currently exploring the compound's mechanism of action on cholesterol metabolism. They now suspect, based on early results in cell and animal studies, that it works by inhibiting the synthesis of cholesterol and triglycerides inside the liver.

A long-term human study of the effect of PMF's on high LDL cholesterol is now in progress. While drinking citrus fruits is full of health benefits, taking PMF supplements could be an easier way to lower cholesterol, since a person would have to drink 20 or more cups a day of orange or tangerine juice to have a therapeutic effect, Kurowska estimates.

KGK Synergize already has developed a nutrition supplement containing PMF's combined with a form of vitamin E that seems to enhance the compound's effect, according to Kurowska. Marketed as a cholesterol-lowering agent under the trade name Sytrinol, the supplement recently became available in the US.

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