Ethanol increases urinary and tissue ascorbic acid concentrations in rats

Changes in serum retinol, alpha-tocopherol, vitamin C, carotenoids, xinc and selenium after micronutrient supplementation during alcohol rehabilitation

OBJECTIVE

To test the effect of a 21-day supplementation with moderate doses of antioxidant nutrients on biochemical indicators of vitamin, carotenoid and trace element levels in alcohol-dependent patients during a program of alcohol rehabilitation.

DESIGN

A randomized double-blind trial was performed comparing two groups receiving daily either a combination of micronutrients (beta-carotene: 6 mg, vitamin C: 120 mg, vitamin E: 30 mg, zinc: 20 mg, selenium: 100 micro g) or a placebo.

SUBJECTS

106 alcohol-dependent patients 20 to 60 years of age without severe liver disease, hospitalized for a 21-day rehabilitation program. Measure of Outcome: Vitamin C, retinol, alpha-tocopherol, zeaxanthin/lutein, beta-cryptoxanthin, lycopene, alpha- and beta-carotene, zinc and selenium were measured in serum, initially and after supplementation.

RESULTS

(1) In the placebo group, after 21 days of rehabilitation, serum concentrations of vitamin C and all five carotenoids significantly increased, whereas retinol and alpha-tocopherol concentrations decreased; zinc and selenium levels were unaffected. (2) At the end of the hospital stay, serum indicators were significantly improved in the supplement group as compared to the placebo group for vitamin C, alpha-tocopherol, beta-carotene, zinc and selenium; conversely, lycopene changes were higher in the placebo group than in supplement group. (3) Of the serum antioxidants measured at entrance, only vitamin C was significantly depleted in heavy smokers, and, after the supplementation period, vitamin C was efficiently repleted in this later group.

CONCLUSION

Our results indicate that a short-term supplementation with physiological doses of antioxidant vitamins, carotenoids and trace elements during alcohol rehabilitation clearly improves micronutrient status indicators. Heavy smokers in particular seem to respond to vitamin C supplementation.

Red wine effects on peroxidation indexes of rat plasma and erythrocytes

Moderate wine intake has been associated with low risk for cardiovascular disease, possibly due to its polyphenol content. We investigated the influence of these compounds on peroxidative indices of blood. Forty Sprague-Dawley rats were divided into four groups given the same AIN-76 diet but different types of isocaloric beverage: red wine, alcohol and dealcoholated wine and water with added sucrose. Rats consumed about 35 ml day(-1) of beverage and 17 g day(-1) of diet for a total of about 95 kcal day(-1). Plasma alpha-tocopherol was higher in the alcohol group and the peroxidation kinetic slope was higher in the control and dealcoholated wine groups. Ascorbic acid in whole blood was higher in the alcohol group than the others. Erythrocytic glutathione peroxidase activity was lower in the red wine group. The other variables studied, were not significantly different in the four groups. Despite the significant differences observed, the oxidative status of blood does not appear seriously altered by heavy ingestion of wine and thus of polyphenols. Probably the balanced diet and adequate intake of micronutrients were sufficient to counteract any oxidative damage.