RESUMEN
OBJECTIVE: We assessed the influence of alcohol-free beer on factors implicated in atherosclerosis, such as lipid profile, oxidative stress parameters, and proinflammatory cytokines, in postmenopausal women, a population particularly at risk for atherosclerotic disease. METHODS: The study was carried out in 29 nuns, 58 to 73 y old, who live in a convent with a disciplined, regular, and homogeneous lifestyle. The nuns maintained their habits and diet routine, but their meals were supplemented with 500 mL/d of alcohol-free beer (0.0%) divided into two doses over a 45-d period. Lipid profile, inflammatory markers such as C-reactive protein, interleukins 1 and 6, and tumor necrosis factor-alpha, and parameters of oxidative metabolism were determined before and after the study period. RESULTS: There were no differences in the levels of C-reactive protein and proinflammatory cytokines after diet supplementation. The antibody titers to oxidized low-density lipoprotein were significant lower (P < 0.05), and thiobarbituric acid-reactive substances (-18%, P < 0.001) and plasma carbonyl group content (-21%, P < 0.001) were decreased when compared with initial values. Increases in alpha-tocopherol levels (+9%, P < 0.05) and erythrocytic glutathione levels (+29%, P < 0.001) were also noted. With respect to lipid profile, only subjects with cholesterol levels higher than 240 mg/dL showed lower levels after supplementation. CONCLUSION: Consumption of non-alcoholic beer produces a decrease in oxidative stress that can have a beneficial impact on cardiovascular risk; however, the circulating concentrations of inflammatory mediators involved in its pathophysiology remained unchanged.
Asunto(s)
Cerveza , Mediadores de Inflamación/sangre , Inflamación/sangre , Lípidos/sangre , Estrés Oxidativo/efectos de los fármacos , Bebidas , Biomarcadores/sangre , Proteína C-Reactiva/metabolismo , Enfermedades Cardiovasculares/sangre , Enfermedades Cardiovasculares/epidemiología , Enfermedades Cardiovasculares/prevención & control , Etanol/administración & dosificación , Femenino , Humanos , Interleucinas/sangre , Peroxidación de Lípido , Persona de Mediana Edad , Oxidación-Reducción , Posmenopausia/sangre , Sustancias Reactivas al Ácido Tiobarbitúrico/metabolismo , Factor de Necrosis Tumoral alfa/sangreRESUMEN
BACKGROUND: Oxidative stress has been linked to such degenerative diseases as atherosclerosis, and it has been suggested that increased dietary intake of antioxidants may reduce its progression. OBJECTIVE: To determine the effect of mandarin juice consumption on biomarkers related to oxidative stress in hypercholesterolemic children. MATERIALS AND METHODS: The diet of 48 children with plasma cholesterol >200 mg/dL and low-density lipoprotein cholesterol >130 mg/dL was supplemented for 28 days with 500 mL/day of pure (100%) mandarin juice (Citrus clementina Hort. ex Tan.). The composition of the mandarin juice was analyzed, and its antioxidant antiradical activity was evaluated in vitro. Malondialdehyde, carbonyl groups, vitamins E and C, erythrocyte-reduced glutathione, and plasma lipids were measured at the onset and at the end of the supplementation period. The paired Student t test was used to compare values before and after supplementation. RESULTS: Mandarin juice exerted a strong antioxidant effect mainly due to its high hydroxyl activity and, to a lesser extent, to its superoxide scavenger activity. At the end of the study, levels of the plasma biomarkers of oxidative stress were significantly decreased (malondialdehyde -7.4%, carbonyl groups -29.1%, P < 0.01), whereas the plasma antioxidants vitamin E and C (13.5%, P < 0.001 and 68.2%, P < 0.00001, respectively) and intraerythrocyte glutathione level (36.7%, P < 0.00001) were significantly increased. Plasma lipids and antibodies to oxidized low-density lipoproteins remained unchanged. CONCLUSIONS: Regular ingestion of mandarin juice significantly reduces plasma biomarkers of lipid and protein oxidation and enhances the antioxidant status of consumers.