ACE Health Coach Certification Practice Test 2026 - Free Health Coach Certification Practice Questions and Study Guide

One gram of protein yields 4 kcal of energy. This value is a standardized figure used in nutritional sciences and reflects the caloric energy that the body can derive from protein during metabolic processes. Proteins, which are made up of amino acids, serve various essential functions in the body, including tissue repair, immune function, and hormone production.

When it comes to energy metabolism, proteins are often not the body’s primary source of energy, as carbohydrates and fats are utilized more efficiently. However, in circumstances where carbohydrates are limited, proteins can be converted to glucose through gluconeogenesis, releasing energy in the process. The 4 kcal per gram figure is the result of scientific studies that have measured the energy released when proteins are metabolized.

Understanding the caloric yield of nutrients, including protein, is critical for health coaches and nutritionists in creating balanced meal plans and educating clients on macronutrient intake for optimal health and performance.