Exercise, from a public health perspective, is an unmitigated failure. The world's longest-lived people live in environments that nudge them into more movement. They don't use power tools, they do their own yard work, they grow a garden.

The longest-lived people eat a plant-based diet. They eat meat but only as a condiment or a celebration. Nothing they eat has a plastic wrapper.

The secret to longevity, as I see it, has less to do with diet, or even exercise, and more to do with the environment in which a person lives: social and physical. What do I mean by this? They live rewardingly inconvenient lives.

Diet and supplements and exercise programs aren't what is achieving longevity. Having a faith-based community can add four to 14 years.