mTOR is an ancient molecular signaling pathway that is responsible for either growth or repair, depending on whether it is stimulated or inhibited
To upregulate maintenance and repair, boost longevity, and reduce your risk for cancer, you need to suppress the mTOR pathway, and the most efficient way to do this is to limit your protein intake
For longevity, aim for a diet high in healthy fats, low in net carbs, with moderate amounts of high quality protein. Ideally no more than about 1 gram per kilo of lean body mass