"Athletes should avoid alcohol, caffeine, and carbonated beverages following strenuous exercise. Alcohol post-exercise can impede recovery by hampering the body’s attempt to rehydrate, and it can interfere with the body’s ability to replenish glycogen and impair the tissue-repair process. Alcohol also promotes vasodilation, which can cause an increase in body-heat loss in cold weather, increasing susceptibility to hypothermia. And, it is a diuretic, causing further dehydration.
Caffeine is also a diuretic, resulting in only 50-percent fluid retention, and is therefore not an appropriate post-exercise fluid choice. Carbonated beverages are not the optimal choice either, as an athlete may feel full before optimally rehydrating. A good rule of thumb is juice first, beer, soda, or latte later! Another point to consider is the temperature of the beverage. Cool drinks may permit increased intake over ice-cold beverages."

From this web site.