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For example, cooking tomatoes increases their lycopene content, a powerful antioxidant.

By deleting or adding selected genes, they engineered strains that produced zeaxanthin as well as other valuable carotenoids -- beta-carotene, lycopene and astaxanthin -- when grown on an aromatic compound commonly found in lignin.

The exceptions include lycopene in tomatoes, the compound that gives tomatoes their red color, which is actually higher in canned tomatoes than fresh tomatoes.

For prostate cancer, eating foods rich in the antioxidant lycopene, such as tomatoes, appears to lessen the risk.

However, pizza might — just might — also be considered a health food because of the powerful chemical antioxidant in cooked tomatoes called lycopene.