Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA. Arkansas Children's Nutrition Center, Little Rock, AR 72202, USA. Arkansas Children's Research Institute, Little Rock, AR 72202, USA. Center for Human Nutrition, Department of Food Science, University of Arkansas System Division of Agriculture, Fayetteville, AR 72704, USA. Reynolds Institute on Aging, Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.