Ann Arbor: Vitamin B12 deficiency in elementary school children from Bogotá,
Colombia, was strongly associated with the students having to repeat a
grade and with their number of school absences, researchers from the
University of Michigan School of Public Health found.
Dr. Eduardo Villamor and team discovered that students deficient in vitamin B12 were at 2.4 times greater risk of repeating a grade, and had 1.9 times more absences than those who were not deficient.