Researchers have found links between obesity and only children.
Well, perhaps. I was an only child, and I was a chubby youngster. I didn’t lose weight until my teen years, when I took up distance running, and began to focus on maintaining a healthy diet.
I’m not sure, though, if my weakness for carbs had anything to do with my lack of siblings. I’m in my fifties now, and I still have a weakness for carbs. Make of that what you will.