Happy hour may not be so happy after all, as researchers have discovered that the risk of developing a stroke is twice as high the hour immediately after consuming alcohol, even if it was as little as one drink.

Exactly why this occurs is not fully understood, but study researcher Murray A. Mittleman theorizes that alcohol may increase blood pressure levels or affect the blood's ability to clot. High blood pressure and abnormal blood clotting can increase one's risk of developing a stroke.

What's perplexing to these researchers is that numerous other studies have shown that moderate alcohol consumption (no more than two drinks per day for men and one drink per day for women) may provide some important health benefits including lower risk for heart disease and stroke. Learn the full details via WebMD