Partner weight status and subject weight loss: implications for cost-effective programs and public health.

This study examined the difference in body changes of subjects with overweight partners and those with normal weight partners. The 9 subjects with normal weight partners lost significantly more weight than the 14 subjects with overweight partners by the end of the one-year treatment program (27.9 lbs versus 20.2 lbs, respectively) and at 3-month follow-up (29.6 lbs vs. 17.3 lbs, respectively). It was also found that both overweight and normal weight partners lost weight incidental to treatment but as expected, body changes of overweight partners significantly decreased over time whereas body changes of normal weight partners did not. Overweight partners and subjects lost statistical equivalent amounts of weight but there was a significant correlation at posttreatment between body changes of subjects in the overweight partner group and their partners. It was concluded that if body changes of both subjects and their overweight partners are considered, couples programs might be a cost-effective and important public health approach because two individuals lose weight as inexpensively as one and more people are treated. Researchers are encouraged to report weight status and body changes of both subjects and partners in order to understand more fully the relationship between partner weight status and subject weight loss.