Watercress may significantly reduce DNA damage to white blood cells and increase the level of antioxidants in your body, while reducing your risk for cancer, according to British researchers. Hate greens? You don’t have to eat a trough of watercress to reap the health benefits — just a small bowl. Here are a few simple chef-approved tips beyond salad: Add the mustardy green to your sandwich in place of lettuce, or make a watercress pesto as a topping for pasta or crostini.