Next time your buttons get pushed, reach for a banana, says Molly Kimball, RD, a certified specialist in sports dietetics with Ochsner's Elmwood Fitness Center in New Orleans. With only 105 calories and 14 grams of sugar, a medium banana fills you up, provides a mild blood sugar boost, and has 30 percent of the day's vitamin B6, which helps the brain produce mellowing serotonin, getting you through a crisis peacefully.