In a first-of-a-kind study, Canadian researchers tested children born to obese women, plus their brothers and sisters who were conceived after the mother had obesity surgery. Youngsters born after mother lost lots of weight were slimmer than their siblings. They also had fewer risk factors for diabetes or heart disease later in life.

Concern over weight loss surgery in fertile women who became pregnant has been conclusively answered in previous studies which found that women were able to conceive healthy children who were not under-nourished. In many instances, where women suffered polycystic ovarian syndrome, weight loss surgery increased their fertility and their chances to conceive.
This new fascinating study, suggests that weight loss surgery altered what most in the medical community believed to be familial obesity (i.e. inherited weight gain) through a genetic modification. Although environmental factors, such as dietary patterns and increased mobility following weight loss surgery also positively impacted on offspring, it is thought that the surgery altered body weight on a genetic level.
This finding, if proven by further studies to be true, means that the effect of weight loss surgery is not only beneficial to the individual but is also passed on to the generations that follow.