Behold the ultimate low-calorie food, the celery stick. Many would relegate this simple stalk to rabbits and rabid dieters, but that would be a mistake. In addition to being one of nature's lowest-calorie foods at about five calories a stem, it packs a ton of nutrition.
It's also thought that certain phytochemicals, called phthalides, found in celery may relax muscle tissue in artery walls, increase blood flow and thereby help lower blood pressure. Read on to discover other surprisingly low-cal foods that offer big nutritional payoffs, based on information from The Men's Health Big Book of Food & Nutrition: