Harvard nutrition experts say there is no solid evidence that organic foods in general are healthier for humans, but that organically raised meat may prevent the spread of diseases such as bovine spongiform encephalopathy, better known as mad cow disease.

Conventionally raised livestock can catch this disease by eating the meat or bones of infected animals. But because animals sold as organic meat do not eat slaughtered animals, they are unlikely to catch mad cow disease.

Perhaps the most common concern about conventionally grown foods is the fear of ingesting pesticides...

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