Exercise is very beneficial, but it could be just walking (I have spoken to hundreds of octogenarians+, that was the #1 response to "How did you live to this age?").

NPK (Nitrogen, Phosphorous, Potassium) farming has degraded the nutrition in soil, thereby in our food. Organic farming is help restore the micro-nutrients, but is very difficult to do on a widespread scale. Storing and processing food removes many of the remaining nutrients, especially vitamins. Obviously herbicides, pesticides, and GMOs are designed to increase yield of the crop, not the health of those ingesting this food.

Healthiest food is raw food from an organic farmer nearby, but the happiest people seem to have a balance.

Old argument -->http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970105.html ... Didn't the ozone layer used to protect the planet from cosmic rays?