This fleshy green should be at the top of your list when it comes to vegetables. It's rich with a healthy supply of iron, calcium, fiber, and vitamin C, meaning it's good for the circulatory system, bones, and fighting colds. "As far as vegetables go, this is the one I try hardest to get more guys to eat," says Niki Kubiak, R.D., a private practice nutritionist in Omaha, Neb. Brocco-phobic? Try it on the sly: Slip it into stir-fries, onto pizza, or use raw chunks as a vehicle for your favorite dip.