Yes, that's an excellent point. The socioeconomic status of your parents is a big influence up to a point. In developed counties we don't see this effect as muc

Yes, that's an excellent point. The socioeconomic status of your parents is a big influence up to a point. In developed counties we don't see this effect as much because it's the baseline. Almost everybody gets sufficient nutrition and medical care to meet the very low standards where it would otherwise negatively affect your intelligence and development.