Family, friends can influence weight and mood, from Harvard Men's Health Watch

Social interactions have ripple effects on weight and mood that extend far beyond household and family units, reports the December 2011 issue of the Harvard Men's Health Watch.

Weight: Two of every three Americans are overweight or obese. There are many explanations for our expanding waistlines, starting with lack of exercise and excessively large portions of calorie-dense prepared and processed foods. But an interesting study suggests that social interactions may also play a role.

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