In this large study, 35,551 female participants were followed for 10 years to compare the intake of dietary lutein and cataract. Women who reported high dietary consumption of lutein were less likely to develop cataract, indicating that eating lutein-rich foods may reduce risk of cataract. Further clinical studies of patients taking lutein supplements or placebo are needed to determine if these protective effects were due to dietary lutein alone.
This study invovled 856 patients with newly diagnosed urothelial cell carcinoma (UCC) who were were matched with 856 members by sex, age at baseline, study center, date and time of blood collection, and fasting status. Plasma carotenoids that were measured included alpha and beta carotenes, beta-cryptoxanthin, lycopene, lutein, and zeaxanthin. Researchers report that the risk of UCC decreased with greater concentrations of plasma lutein and beta-carotene.