In today's health matters, losing weight may be a family affair. A new study finds if a family member undergoes weight loss surgery, it may prompt other family members to shed pounds as well.

Researchers tracked nearly three dozen families where one member underwent gastric bypass surgery. Patients and their families attended classes on dietary and lifestyle changes before and after surgery.

One year later, obese patients had lost about a third of their body weight.
And, the average weight loss for a spouse or child was about eight pounds.

Prior researcher found obesity may have a social aspect as people may become obese if their friends or family are.

The study is published in 'Archives of Surgery.'