There is no Recommended Dietary Allowance (RDA) for choline; most people get anywhere from 300 to 1,000 milligrams each day from their diet, which seems to be enough to prevent a deficiency. Adequate daily intake is 425 milligrams for adult women (450 milligrams if pregnant and 550 milligrams if nursing), and 550 milligrams for adult men. Because choline has been linked to brain development in newborns, all pregnant and nursing women need to be certain to get plenty of choline in their diet by eating plenty of lecithin-rich foods (supplementation for healthy pregnant and nursing women is not recommended).