Calorie is a unit of energy in food we consume.
Macronutrient food groups
The various food groups such as carbohydrates, fats, protein, and alcohol in the foods and drinks we eat provide food energy or “calories”.
Calories in major food groups
- Carbohydrates and proteins provide 4 calories per gram
- fat has 9 calories per gram, and
- alcohol has 7 calories per gram.