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Breaking news: Dad bod is now backed by science! According to the American Journal of Men’s Health, men who become fathers experience weight gain and an increase in body mass index. According to the study, men may gain averages of three or four pounds beginning in the first year of fatherhood.

Researchers at Northwestern University’s Feinberg School of Medicine examined the body mass index measurements of more than 10,000 men over the course of 20 years. They obtained data throughout four periods of the participants’ lives, from early adolescence and to the early 30s.

Researchers discovered as long as he didn’t have kids, the average man lost weight over the same time period. The men who became fathers found the dad who lives with his child gained an average of 4.4 pounds, compared to 3.3 pound average for a dad who doesn’t live with his child.

“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,” lead author Craig Garfield, a Northwestern associate professor, said in the release. “Your family becomes the priority.”

Do you or your spouse have the popular dad bod? Tell us in the comments below!

H/T: The Washington Post