A recent study concludes that vitamin B12 deficiencies impair, or possibly delay, brain development in small children. Specifically, the study examines the associations between early vitamin B12 status and various measures on development and cognitive functioning, such as the ability to interpret complex geometrical figures, and the ability to recognize other children`s emotions. Low B12 in infancy can affect child brain development even much later. In the study, conducted by researchers at Uni Research in Bergen, Norway, findings show an association between B12 status as a baby a decrease in cognitive test scores at 5 years of age, where children performed poorly on tests requiring them to do puzzles, and even recognize letters. Read more here.