Gold Kiwifruit May Reduce Symptoms of URTI in the Elderly
Study authors investigated whether regular consumption of gold kiwifruit will reduce symptoms of URTI in older people, and determined the effect it has on plasma antioxidants, and markers of oxidative stress, inflammation and immune function. Participants (n=32)( >= 65 years) in this randomized, crossover study consumed the equivalent of four kiwifruit or two bananas daily for 4 weeks, with treatments separated by a 4-week washout period. Participants completed the Wisconsin Upper Respiratory Symptom Survey-21 daily, and blood samples were collected at baseline and at the end of each treatment and washout period. Researchers found that gold kiwifruit did not significantly reduce the overall incidence of URTI compared with banana, but significantly reduced the severity and duration of head congestion, and the duration of sore throat. Gold kiwifruit increased plasma vitamin C, alpha tocopherol and lutein/zeaxanthin concentrations, and erythrocyte folate concentrations, and r educed plasma lipid peroxidation. No changes to innate immune function (natural killer cell activity, phagocytosis) or inflammation markers (high-sensitivity C-reactive protein, homocysteine) were detected. Gold kiwifruit may contribute to reduced duration and severity of selected URTI symptoms in the elderly.
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