Check out broccoli. It’s a powerhouse of nutrition. One cup of chopped broccoli supplies the daily requirement of vitamin C, plus beta carotene (and other carotenoids), niacin, calcium, thiamin, vitamin E, and 25% of your daily fiber needs. Not only that, but other substances in broccoli, such as sulforaphane, may also protect against cancer. All this for only 30 calories. And don’t forget other cruciferous vegetables, such as cabbage, cauliflower, kale, collards, mustard greens, and Brussels sprouts.