Egg yolks are also rich in lutein and zeaxanthin, but many of us avoid eggs because we’re worried about their cholesterol content. Research led by Thomas Wilson, Ph.D., associate professor with the Center for Health and Disease Research at the University of Massachusetts-Lowell, suggests that we shouldn’t be so concerned. He found that when people ate eggs regularly—as many as two daily—they significantly increased the levels of lutein and zeaxanthin circulating in their bodies without boosting LDL (“bad”) cholesterol levels. Unless your doctor advises otherwise, go ahead and enjoy eggs regularly. (Just don’t go crazy: the American Heart Association still advises limiting cholesterol intake to less than 300 milligrams [mg] daily, and one large egg yolk has about 213 mg.) Take a tip from Dr. Wilson and scramble your eggs with spinach for an even bigger nutrient boost.