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Thursday 7 July 2011

Eggs For A Healthy Heart – And To Prevent Cancer too

Eggs have antioxidant properties and hence are good for the heart. Perhaps they can prevent cancer too, say Canadian researchers. 
Already eggs are known to be an excellent source of proteins, lipids, vitamins and minerals. But their antioxidant value is a newly discovered virtue.Jianping Wu, Andreas Schieber and graduate students Chamila Nimalaratne and Daise Lopes-Lutz of the Department of Agricultural Food and Nutritional Science, University of Alberta,  examined egg yolks produced by hens fed typical diets of either primarily wheat or corn. They found the yolks contained two amino acids, tryptophan and tyrosine, which have high antioxidant properties. 

After analyzing the properties, the researchers determined that two egg yolks in their raw state have almost twice as many antioxidant properties as an apple and about the same as half a serving (25 grams) of cranberries.
However, when the eggs were fried or boiled, antioxidant properties were reduced by about half, and a little more than half if the eggs were cooked in a microwave.
“It’s a big reduction but it still leaves eggs equal to apples in their antioxidant value,” said Wu.
The findings were published in the peer-reviewed journal Food Chemistry.
The discovery of these two amino acids, while important, may only signify the beginning of finding antioxidant properties in egg yolks, said Wu, an associate professor of agricultural, food and nutritional science.
“Ultimately, we’re trying to map antioxidants in egg yolks so we have to look at all of the properties in the yolks that could contain antioxidants, as well as how the eggs are ingested,” said Wu, adding that he and his team will examine the other type of antioxidant already known to be in eggs, carotenoids, the yellow pigment in egg yolk, as well as peptides.

 

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