The phrase "extra protein" refers to consuming more than the average or recommended amount of protein in one's diet. Protein is an essential macronutrient that plays a crucial role in building and repairing tissues, as well as maintaining muscle mass. The daily requirement for protein varies depending on factors such as age, weight, and activity level, but it generally falls between 0.8 to 1 grams per kilogram of bodyweight. Consuming extra protein can be beneficial in various situations, including during periods of growth or recovery from injury, when increased muscle mass is desired, or when trying to maintain muscle while losing weight through calorie restriction. However, it's important not to overdo it as excessive protein intake can lead to kidney strain and other health issues.