Iodized Salt and the Unexpected IQ Boost
New research reveals that adding iodine to salt in the US since 1924 significantly boosted cognitive abilities across the American population throughout the 20th century. Initially implemented to reduce goiter, studies now show iodine's crucial role in brain development. By comparing military enlistment data from before and after 1924, researchers found a 15-point IQ increase in low-iodine areas. While early iodine supplementation caused some thyroid-related deaths, the initiative virtually eradicated iodine deficiency and its consequences. This discovery may also partially explain the Flynn Effect – the observed rise in IQ scores throughout the 20th century – suggesting iodine contributed to a significant portion of this increase.