“I am 52 and, on my current diet, can expect to live another 29 years. But if I change now, I could gain an extra decade and live in good health into my 90s.”

“I am 52 and, on my current diet, can expect to live another 29 years. But if I change now, I could gain an extra decade and live in good health into my 90s.” Gaining an extra decade seems perfectly reasonable by taking care of our biological machines. However, do we really understand enough to know what actually works?