Delicious when added to brown rice, reiki, shiitake, and maitake mushrooms are rich in the antioxidant ergothioneine, which protects cells from abnormal growth and replication. “In short, they reduce the risk of cancer,” says Bowerman, who recommends half a cup once or twice a week. “Cooking them in red wine, which contains resveratrol, magnifies their immunity-boosting power.”