Protein plays a critical role in weight management by promoting satiety and preserving muscle mass. When you consume adequate protein, it helps reduce hunger hormones and increases the levels of hormones that promote fullness. This can lead to lower overall calorie intake. Additionally, protein has a higher thermic effect compared to fats and carbohydrates, meaning the body burns more calories digesting it. Thus, a diet rich in lean protein can support weight loss efforts and help maintain a healthy weight.