A calorie is a unit of energy. When you hear something contains 100 calories, it’s a way of describing how much energy your body could get from eating or drinking it. There are calories in each of the three main macronutrients that we eat – carbohydrates, fats and proteins. Each macronutrient contains the following calories per gram:

🔺Carbohydrate: 4 calories
🔺Fat: 9 calories
🔺Protein: 4 calories