So is height, and historically there have been large differences in height between the rich and poor. In modern developed countries, however, there doesn't seem

So is height, and historically there have been large differences in height between the rich and poor. In modern developed countries, however, there doesn't seem to be any significant difference based on socioeconomic level. That leads me to believe that these "nutritional deficiencies" don't exist and are not what is causing any observed gap in IQ or academic achievement.