If you're waking up this first day of 2013 with a pounding headache, you are not alone. Professional nutritionists say New Year's revelers who feel that ubiquitous malady known as a "hangover" are actually experiencing dehydration as a result of consuming too much alcohol. Naturally, the best way to avoid a hangover is to simply stay away from the sauce. But if that's no longer an option they say the next-best choice is to avoid your temptation to chow down on a half-dozen hamburgers. Instead, reach for the H-Two-Oh, regular tea or eat a nutritious meal.