“Docosahexaenoic acid (DHA) is essential for the growth and functional development of the brain in infants.
“DHA is also required for maintenance of normal brain function in adults. The inclusion of plentiful DHA in the diet improves learning ability, whereas deficiencies of DHA are associated with deficits in learning. DHA is taken up by the brain in preference to other fatty acids.”
Read more at the NIH