Garzon said that the rehydration effection in those who were given beer was "slightly better" than those who were given only water. He also believes that the carbon dioxide in beer helps quench thirst more quickly, and that beer's carbohydrates replace calories lost during physical exertion.
Based on the results of the study, researchers recommend moderate consumption of beer as a part of athletes' diets. "Moderate consumption" for men is 500ml per day, and for women is 250ml per day.
I'm glad we've been doing it right all this time.