The world is beset by many problems, but in my opinion, this hijacking of our brain's reward centers by electronic media is potentially one of the most destructive.

Each day as I travel through downtown Tucson, I am amazed at how quickly the most ancient of human behaviors have changed. For as long as there have been Homo sapiens - roughly 200,000 years - people have filled their lives principally with two activities: talking directly with other people, and doing physical things.

The more easily digestible and refined the carbohydrates, the greater the effect on our health, weight and well-being.

Learning to focus attention and concentration is very useful; meditation can help you do that.

Limit or eliminate late-night computer and television viewing. A computer or TV screen may seem much dimmer than a light bulb, but these screens often fill your field of vision, mimicking the effects of a room filled with light.

Short naps are good. Given modern workplace demands, this is not possible for many people - but if you have the option, try napping for ten to twenty minutes in the afternoon, preferably lying down in a darkened room.

Our feet are our body's connection to the earth.