No one’s been able to prove the myth that celery has fewer calories than are burned eating it, though it boasts just 16 calories per 1-cup serving. It also delivers a great dose of bone-building vitamin K (47% of the DV in just 2 stalks!). Not only that, celery contains luteolin, a flavonoid believed to reduce inflammation that can lead to cognitive decline. In a study published in the October 2010 issue of The Journal of Nutrition, mice that ate a diet that included luteolin had better spatial memory (e.g., how quickly they found a platform in a water maze) and less inflammation than mice who didn’t get any luteolin, reported Cheryl Forberg, R.D., in EatingWell Magazine. Celery is one of the top offenders on the so-called “Dirty Dozen”—the Environmental Working Group’s list of the produce that has the most pesticide residue—so if you’re concerned, buy organic.