The usual justification for eating extra meals is that it keeps the metabolism "revved up" so that weight loss is easier. There is, however, very little hard evidence that supports this idea, and a fair amount that disputes it.

Human beings have survived for millennia because most of us make good decisions about our health most of the time.

Routines may include taking a warm bath or a relaxing walk in the evening, or practicing meditation/relaxation exercises. Psychologically, the completion of such a practice tells your mind and body that the day's work is over and you are free to relax and sleep.

One of the most obvious ways dogs can improve our physical and mental health is via daily walks.

Alternative models are neither right nor wrong, just more or less useful in allowing us to operate in the world and discover more and better options for solving problems.

We need to accept the seemingly obvious fact that a toxic environment can make people sick and that no amount of medical intervention can protect us. The health care community must become a powerful political lobby for environmental policy and legislation.

As an undergraduate at Harvard in the 1960s, I was fascinated by my visits to psychologist B.F. Skinner's laboratory.