How many calories are contained in each gram of protein?

Each gram of protein contains four calories. This value is established based on the metabolic energy released when the body metabolizes protein. Proteins are made up of amino acids, which are essential for various bodily functions including tissue repair, enzyme production, and immune system support.

Understanding the caloric content of macronutrients is crucial for nutritional planning and dietary management. Protein plays a significant role in a balanced diet, and knowing that it provides four calories per gram helps individuals and health professionals calculate total caloric intake from protein sources in meals. This is essential for maintaining energy balance, particularly in contexts such as weight management or athletic performance.

The other values presented, such as three, five, and six calories per gram, do not align with established nutrition science. These figures could lead to misunderstandings about dietary intake and nutrient requirements if utilized incorrectly.