What macro nutrient has protein-sparing effect?

Carbohydrates have a protein-sparing effect. When sufficient carbohydrates are available in the diet, they provide the energy needed for bodily functions, allowing protein to be used primarily for growth and repair rather than as an energy source. This helps to preserve muscle mass and support overall metabolic health. Inadequate carbohydrate intake can lead the body to use protein for energy, potentially compromising muscle tissue.