How many kcal are present in one gram of protein?

One gram of protein provides approximately 4 kilocalories (kcal). This caloric value is significant for understanding macronutrient contributions to the diet and is a fundamental aspect of nutritional science and culinary medicine. Proteins are essential macronutrients that play various crucial roles in the body, including building and repairing tissues, producing enzymes and hormones, and supporting immune function.

The classification of protein as a macronutrient, along with carbohydrates and fats, is based on their caloric contributions and physiological importance. While carbohydrates also provide 4 kcal per gram, and fats provide 9 kcal per gram, the specific value of 4 kcal per gram for protein is a well-established standard in nutrition science. This knowledge is essential for creating balanced meal plans that meet dietary needs and total energy requirements.