Calorie/ˈkæləri/ Definition 1 of 2Pro Tip 1/3Diet Context Calorie is commonly used when discussing diets, food energy, and nutrition. She's tracking her daily caloric intake on a diet app. Pro Tip 2/3Health Implications Calories are often associated with weight gain or loss, healthy eating, and exercise. To lose weight, you must consume fewer calories than you burn. Pro Tip 3/3Food Labels Calorie content is highlighted on food packaging, guiding consumers' choices. Always check the calorie count on the label before buying snacks.