We hear plenty about the dangers of high cholesterol levels, but low levels apparently confer their own risks. Naturally low cholesterol levels are associated with poorer performance on a variety of cognitive measures, according to a new study."It is not entirely surprising that lower cholesterol levels were associated with moderately lower levels of cognitive function, given (that) cholesterol is important in brain function,” Dr. Penelope K. Elias from Boston University told Reuters Health.Previous reports have related both high and low total cholesterol levels to deficits in cognitive performance, Elias and her colleagues explain in the journal Psychosomatic Medicine.