How about renaming the IQ Bell Curve "Stupidity Spectrum Disorder"? Seriously low IQ is probably due to bad genes, but mild reductions may be due to nutritional problems during gestation, involving shortages of FREDI: Folate, Retinoids, EFA-[Essential Fatty Acids], Vitamin D, and Iodine. Fatty maternal diet may be the most common cause: it lowers EFA levels in maternal and foetal cell and mitochondrial membranes, causing in the mother both insulin resistance and placental oxidation with inflammation. An inflamed placenta allows leakage of maternal cortisol, which ACTUALLY CAUSES ANXIETY DISORDER IN THE OFFSPRING, while direct oxidation and inflammation in the foetal brain are likely to impair dendritic density and IQ. In 1997, Dr Boyd Metzger noted INTROVERSION in the offspring of diabetic pregnancies (in which fat intake is high), often--but not always--accompanied by reduced IQ. To shift a person, at any age, towards the good end of the Bell Curve, requires 1) Inositol powder, to alleviate the anxiety and prevent comfort-eating of brain-damaging fatty foods 2) a seriously low-fat diet, to reverse depression, current brain oxidation and impaired dendritic branching, and 3) Richard Wurtman's IQ mixture from MIT: fish oil, choline (in eggs and wheatgerm) and uridine (in beets and broccoli): I teach my patients and parents of my child patients "FEBB ulous! for fish, eggs, beets and broccoli, and guess what--IT WORKS!