Lean beef pork or chicken contains most of which energy-supplying nutrient?

Lean beef, pork, and chicken are all Excellent sources of protein, which is the primary energy-supplying nutrient found in these meats. In addition to protein, they also provide varying amounts of fat, which can contribute to energy intake. However, the specific fat content can differ among these meats depending on the cut and preparation method. Overall, protein is the standout energy-supplying nutrient in these lean meats.