When you increase lean body mass by building muscle, you'll not only look better, but burning fat will be so much easier. (build-muscle-and-burn-fat.com)
The figure below shows the relationship between on the one hand the increase in lean body mass and on the other the increase in insulin sensitivity. (ironmagazine.com)
Protein helps to satisfy hunger and provide the necessary building blocks to maintain lean body mass while losing body fat. (strengthtrainingendeavors.com)