Celery is one of the best fat-burning foods. It is really low in calories and also helps burn off more calories because of its thermogenic effect. 75% of a celery stick is made of water, the rest is fibre. It has a mild taste that makes it easy to include in a variety of meals. You can also dip it in low-fat yogurt for a delicious snack. It is also a popular choice as a part of post-workout juices because it is rich in sodium and potassium.