How many calories per gram does protein provide?

Protein provides 4 calories per gram. This is a standard value recognized in nutrition science, reflecting the energy that the body can derive from protein when consumed. The human body uses protein for numerous vital functions, including building and repairing tissues, making enzymes and hormones, and supporting overall physiological functions.

The caloric value is essential for understanding macronutrient contributions to daily energy intake. In contrast, fats offer more energy at 9 calories per gram, which makes them a denser source of calories, while carbohydrates also provide 4 calories per gram, similar to protein. Recognizing these values is crucial for nutritional planning and ensuring a balanced diet that meets energy needs and supports health.