13 of the Best Fat-Burning Foods You Can Eat to Tone Up and Feel Great

"You've probably heard that celery takes more calories to eat than it actually has, and it's not far from the truth!" Kristin said. "The high-water content of cucumber and celery makes them hydrating options that provide soluble fiber and vitamins while being very low in calories." Additionally, diets rich in flavanoids have been associated with reduced weight gain.