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Published on: 5/31/2002
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"We checked on many food items and the allium food group stood out as protective against prostate cancer," said Ann W. Hsing, an NCI epidemiologist and the first author of the study."But the conclusions need to be replicated in another study."She said the study was conducted in Shanghai because China has the lowest rate of prostate cancer in the world.
Scallions seemed to be the most protective.According to the study, men who ate about a tenth of an ounce or more a day of scallions reduced their prostate cancer risk by about 70 percent.For garlic consumption of the same amount, the prostate cancer risk was reduced by about 53 percent.
Hsing said that the typical Chinese diet is much more heavily seasoned with garlic, scallions, and onions than is the traditional American diet.But even so, the amount of allium vegetables consumed is measured only in fractional ounces.For instance, the study suggests that an effective level of prostate cancer protection can be achieved with about one clove of garlic a day.
"The reduced risk of prostate cancer associated with allium vegetables was independent of body size, intake of other foods and total calorie intake," the study authors reported.
Hsing said the study reinforces earlier studies that have linked high vegetable consumption to a reduced risk of prostate cancer.For instance, earlier studies have found that eating tomatoes and tomato products can lower risk of prostate cancer.Italy, where tomato sauce and garlic are favorites, has one of the lowest rates of prostate cancer in Europe, said Hsing.
Janet Stanford, a cancer epidemiologist at the Fred Hutchinson Cancer Research Center in Seattle, said the study by Hsing and her co-authors continues to support the general finding that "eating vegetables is a good thing."