At least according to this article from across the pond, which cites a correlation between between working mothers and obesity that is so specific, it's laughable. According to researchers at the UCL Institute of Child Health in Scotland,
children are more likely to be overweight for every ten hours a mother
worked. This risk increases in the highest-earning families.
They theorize that children of working mothers "have less access to healthy foods and physical activities."
You've gotta admire those obesity researchers--they can find a risk factor in just about anything.