A weighty wedlock

Research conducted by faculty at University of Queensland in Australia indicates that "...After adjusting for other variables, the 10-year weight gain for an average 140-pound woman was 20 pounds if she had a baby and a partner, 15 if she had a partner but no baby, and only 11 pounds if she was childless with no partner. The number of women with a baby but no partner was too small to draw statistically significant conclusions. There is no reason to believe that having a partner causes metabolic changes, so the weight gain among childless women with partners was almost surely caused by altered behavior. Moreover, there was a steady weight gain among all women over the 10 years of the study. This does not explain the still larger weight gain in women who became pregnant. The lead author, Annette J. Dobson, a professor of biostatistics at the University of Queensland in Australia, suggested that physiological changes might be at work. “Women’s bodies may adjust to the increased weight associated with having a baby,” Dr. Dobson said. “There may be a metabolic adjustment that goes on when women are pregnant that is hard to reverse. This would be more consistent with our findings than any other explanation.” The study covered more than 6,000 Australian women over a 10-year period ending in 2006..." (from NYT).

/* There are quite a few marriage penalties - however, it is too thick to accept that weight gain is a heavy loss... */