There’s another study out saying that if you’re exposed to a low level of oxidative stress, it turns on a protective mechanism in your body and you end up living longer. This is what happens when you exercise – you burn a lot of energy – and that creates free radicals – by products of metabolism – and that turns on protective mechanisms. The studies say that a gene known as Mga2 is turned on and that really facilitates this pathway. It’s another piece of the aging puzzle. Sources (1,2).