A new study that tracked more than 10,200 men over a 20-year period finds those who became fathers gained weight, whether or not they wound up living with their kids.

The men who didn’t become dads? They actually lost weight, over the same period. WaPo’s Elahe Izadi breaks down the findings, with some examples:

Weight gain differed for dads who lived with their children (“resident dads”) and those who didn’t. First-time resident dads experienced an average 2.6 percent increase in their BMIs over the study period. Non-resident dads experienced 2 percent increase. That translates to a 4.4 pound weight gain for a 6-foot-tall dad who lives with his child and a 3.3 pound weight gain for a non-resident dad. Meanwhile, a similar 6-foot-tall man who had no kids? He lost 1.4 pounds.

The BMI increase may be the result of lifestyle changes, researchers said.

“You have new responsibilities when you have your kids and may not have time to take care of yourself the way you once did in terms of exercise,” Garfield said. “Your family becomes the priority.”


No word yet on these other types of bods.

The researchers’ findings appear, free of charge, in the latest issue of the American Journal of Men’s Health.



Contact the author at rtgonzalez@io9.com. Top photo via Shutterstock.