Quick, clear definitions and guides for key concepts. Browse alphabetically or jump to a term on the right.
Weight-to-height ratio often used to classify weight status.
Calories your body burns at rest to keep you alive.
Percentage of your body made up of fat.
Eating fewer calories than you burn to lose weight.
Protein, carbs, and fats that make up your calories.
Daily calories that keep your weight stable.
Calories burned from daily movement outside of exercise.
Total calories you burn in a day, including activity.
Energy your body uses to digest and process food.