Beer increases plasma antioxidant capacity in humans

Area of Science:

• Nutritional Science
• Biochemistry
• Human Physiology

Background:

• Moderate alcohol consumption is linked to reduced cardiovascular disease risk.
• Polyphenols in beverages like beer may contribute to health benefits beyond ethanol.
• Understanding the metabolic fate of beer components is crucial for health research.

Purpose of the Study:

• To investigate the impact of acute beer, dealcoholized beer, and ethanol intake on plasma antioxidant status.
• To analyze changes in specific phenolic acids in human plasma after beverage consumption.
• To assess the role of ethanol versus polyphenols in observed physiological effects.

Main Methods:

• 14 healthy human subjects participated in the study.
• Plasma samples were collected at baseline (T0), 1 hour (T1), and 2 hours (T2) post-ingestion.
• Measurements included total plasma antioxidant capacity and high-performance liquid chromatography (HPLC) analysis of phenolic acids (caffeic, sinapic, syringic, vanillic).

Main Results:

• Beer consumption significantly increased plasma antioxidant capacity at T1 (P < 0.05).
• Phenolic acids (syringic, sinapic) showed a tendency to increase in plasma post-beer intake, with statistical significance observed for syringic and sinapic acids.
• Dealcoholized beer and ethanol alone did not significantly alter plasma antioxidant capacity or phenolic acid levels.

Conclusions:

• Beer intake enhances plasma antioxidant capacity and increases circulating phenolic acids in humans.
• The observed benefits are primarily attributed to non-ethanol components, likely polyphenols, present in beer.
• Ethanol itself does not contribute to the acute increase in plasma antioxidant status observed after beer consumption.