How many calories are provided by one gram of protein?

One gram of protein provides 4 calories. This is a fundamental concept in nutrition and exercise metabolism, rooted in the biochemical makeup of macronutrients. Proteins are made up of amino acids, and when they are metabolized in the body, they yield energy as a byproduct. This energy is quantified in calories, which serve as a measure of energy.

Proteins, along with carbohydrates, provide approximately 4 calories per gram. This caloric value is essential for nutrition planning and understanding how different macronutrients contribute to overall energy intake. This knowledge is particularly valuable for athletes and individuals engaged in regular exercise, as it helps them manage their dietary intake to support performance and recovery.

In contrast, fats provide a higher caloric density at 9 calories per gram, while alcohol contributes about 7 calories per gram. Understanding these differences helps in structuring a balanced diet that meets specific energy and macronutrient needs.