“Two new studies find that children with higher lutein levels in the eye tend to do better than others on tests of cognition and academic achievement, even after accounting for other factors known to influence academic performance such as IQ, gender, body composition and physical fitness.”
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Anne M. Walk et al, From neuro-pigments to neural efficiency: The relationship between retinal carotenoids and behavioral and neuroelectric indices of cognitive control in childhood, International Journal of Psychophysiology (2017). DOI: 10.1016/j.ijpsycho.2017.05.005
Sasha M. Barnett et al. Macular pigment optical density is positively associated with academic performance among preadolescent children, Nutritional Neuroscience (2017). DOI: 10.1080/1028415X.2017.1329976