How many calories are provided by each gram of protein?

Each gram of protein provides 4 calories. This is a well-established figure in nutrition and is important for understanding macronutrient energy contributions. Proteins are essential macronutrients that play a critical role in building and repairing tissues, as well as in various metabolic processes. When planning a diet or structuring meals, knowing the caloric content of macronutrients, including protein, helps individuals achieve their dietary goals, whether for weight loss, muscle gain, or overall health.

Other macronutrients like carbohydrates also provide 4 calories per gram, while fats provide a higher energy density at 9 calories per gram, and alcohol provides 7 calories per gram. Understanding these key differences allows for better nutritional planning and informed dietary decisions.