Day 10: Keep a Food Log

It’s a pain in the butt, but it’s shockingly effective at helping people eat healthier, according to a study in the Journal of the Academy of Nutrition and Dietetics. The researchers found that people who recorded everything they ate for a week lost six more pounds than people who didn’t. Don’t bother buying a notebook—smartphone apps like MyFitnessPal, Lifesum, and Eatly make recording what you eat easy. All three also sync with third party fitness trackers, helping you gain a more holistic view of your health and daily activity.

How do you keep track of what you eat? Comment below.

For more 31 Days of Fitness tips, check here for a new one every day in December.