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Aug. 8, 2002 |
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Current thinking about canned corn turned on its ear ITHACA, N.Y. -- Aug. 8, 2002 (Cancer Digest) -- Canned corn may be healthier for you than corn on the cob, according to nutrition scientists. The researchers say that heat processing of sweet corn significantly raises the level of naturally occurring compounds that help fight disease. The findings are reported in the Aug. 14 issue of the Journal of Agricultural and Food Chemistry, a publication of the American Chemical Society. Sweet corn is the number-two processed vegetable in the United States, second only to tomatoes, according to by Cornell University assistant professor of food science, Dr. Rui Hai Liu, who is lead author of the paper. "It's conventional wisdom that processed fruits and vegetables have lower nutritional value than sweet fresh produce," Liu said. This is because processing leads to a decrease in vitamin C -- an antioxidant that prevents cell and tissue damage and purportedly gives fruits and vegetables their disease-preventing abilities. The study showed that heat processing of sweet corn, which is how canned corn is prepared, increases both total antioxidant activity and the level of phenolics -- a naturally occurring type of phytochemical found in many fruits and vegetables. Heating sweet corn, whether it is on the cob, in a casserole, or in the can, enhances its beneficial compounds, Liu noted. Processing at 115 degrees Celsius for 25 minutes elevated total phenolics by 32 percent, with ferulic acid -- the predominant phenolic compound in sweet corn -- increasing by 550 percent. Liu's ongoing investigation of fruits and vegetables contradicts conventional wisdom. In a study, published two years ago, Liu and his team found that less than 0.4 percent of an apple's antioxidant activity comes from vitamin C. Instead, a combination of phytochemicals supplies the antioxidants in apples. This led Liu to suspect that processed fruits and vegetables might actually maintain their antioxidant activity despite the loss of vitamin C. Earlier this year, in another study the researchers reported that cooking tomatoes triggers a rise in total antioxidant activity, chiefly due to an increase in lycopene -- a phytochemical that makes tomatoes red. The findings are obviously good for the processing industry, Liu said, but they are also good for the consumer. "It doesn't matter if it's raw; it doesn't matter if it's cooked; it doesn't matter if it's fresh; it doesn't matter if it's processed. You simply need to eat a variety of fruits and vegetables to get maximum health benefits." |
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