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Even moderate caloric restriction lowers cancer risk in mice

A new National Cancer Institute study reported April 23 by Dr. Volker Mai at the Experimental Biology 2002 meeting in New Orleans shows that even moderate caloric restriction reduced by 60 percent the number of precancerous intestinal polyps in mice at high risk of gastrointestinal cancers (mice with the same genetic mutation seen in some humans who develop these cancers). Dont think you can eat less? Then eat better. Animals eating as much as they wanted of a diet high in olive oil, fruits and vegetables also had a third fewer polyps than control mice.

Thats good news, says Dr. Mai, since this moderate caloric restriction and/or the use of a diet in which fat came from olive oil are more likely to be followed by humans and have been shown to have broad health benefits even beyond an effect on gastrointestinal cancer risk. The findings are more troubling, he adds, when you think about the continuing trend of high caloric food intake observed in most developed nations. How much is too much? Working with a well-proven mouse model of intestinal cancer, the NCI researchers allowed some mice to eat as much food as they wanted. As mice will, they ate almost all the time, with weight gain to show for it. The researchers measured the mices food intake and limited similar mice to only 60 percent of the amount. This satisfied all their nutritional requirements and provided a goodly amount of food to eat as well. The result: the number of the precancerous polyps also went down by 60 percent compared to the mice eating as much as they wanted.

Previous mouse studies, like epidemiological studies of humans, have shown that what gets eaten also has an effect on colorectal cancers. So Dr. Mai and his colleagues at NCI compared the number of polyps in mice on a high fat diet, mice on a healthy diet with olive oil and fruit and vegetable extract, and mice on the standard laboratory mouse diet. Mice consuming a diet high on fruits and vegetables had 33 perce
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Contact: Sarah Goodwin
eb2press@bellsouth.net
770-722-0155
Federation of American Societies for Experimental Biology
23-Apr-2002


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