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Confession: Today I ate three cookies. Not because I particularly wanted them, but because they were there. I could be a case study for Brian Wansink's book "Mindless Eating: Why we eat more than we should." Wansink and his colleagues apply psychology and behavioral economics to food marketing.

If you want to develop good health habits that are associated with a longer, healthier, and happier life you have to start early...very early! Research and clinical practice clearly shows that health habits develop very early in life and, once well established, are exceedingly difficult to change.

Weight loss is a $40 billion dollar a year industry. Advertisers lure us with images of a healthy and happy life spent running along the beach with the sun shining overhead, then heading home to eat our grapefruit and take our diet supplement.

Mr. Dunbar told him that social networks resemble a set of concentric circles: 150 people constitute the outer boundary of friends, 50 is the limit for trusted friends, 15 for good friends, and 5 for best friends.

When I was a resident I was given the opportunity to participate in a series of seminars designed to improve my teaching skills. In one discussion group the discussion leader asked us a question to which no one had an immediate answer. So he waited. And waited. And waited.