If broccoli and spinach are the rock stars of the vegetable world, then celery and lettuce are the stage-hands, working hard out of the limelight. For years we've dismissed these pale staples as nutritionally barren, focusing our attention
. Not only do avocados contain heart-healthy monounsaturated fats but researchers at Ohio State University discovered that their phytochemicals can help prevent mouth cancer.2. GarlicThe pungent bulb is an enemy of cancer. But don't throw it straight
