Never mind

Men who started smoking before age 11 had fatter sons

Men who started smoking regularly before the age of 11 had sons who, on average, had 5-10kg more body fat than their peers by the time they were in their teens, according to new research from the Children of the 90s study at the University of Bristol. The researchers say this could indicate that exposure to tobacco smoke before the start of puberty may lead to metabolic changes in the next generation.

Well, since smoking is well known to reduce weight and documented to reduce insulin resistance, maybe the fathers transmit that trait directly to their sons...