The author decided to improve their fitness by maintaining a food diary on their smartphone and explored two AI-powered calorie-tracking apps, BitePal and SnapCalorie. Both apps allow users to log meals by taking pictures and integrate Google Health data to track food intake and physical activities. BitePal features a charming design and user interface, while SnapCalorie offers a more extensive food library and projected an earlier completion date for the author's weight loss goal compared to BitePal. The author chose to trust SnapCalorie for their fitness journey.