How many calories are in 1 gram of protein?

Proteins provide 4 calories per gram, making them an important macronutrient for energy. This is consistent with the accepted nutritional standards that categorize energy contributions from macronutrients. Proteins serve various essential functions in the body, including building and repairing tissues, producing enzymes and hormones, and supporting immune function. The caloric value of protein is significant for those planning their dietary intake, as it helps in determining the overall energy balance within a meal or diet plan. Understanding that there are 4 calories in each gram of protein is foundational for nutritional calculations and is critical for anyone studying nursing or health sciences.