Google Fit uses a combination of your activity, your gender, your height, and your weight to estimate how many calories you burned. It's an estimate of total calories burned and includes your basal metabolic rate (BMR), not just calories you burned in your activity.
Can you track food on Google Fit?
If you enter nutrition and hydration information through a connected app, Google Fit will track your food and drink. Nutrition and hydration information can include caloric intake, macronutrients, micronutrients, and water intake.
What food tracking apps work with Google Fit?
Google announced today that, at long last, Google Fit can intake data from other popular fitness and food tracking apps, such as MyFitnessPal, Fatsecret, Lifesum, or LoseIt.19 Nov 2015