The heavy, lethargic feeling of a boozy evening isn't just reservered for the morning after. According to DrinkWise Australia alcohol can limit the efficiency of your digestive system in the long term:

"Research has shown that even moderate drinking can potentially lead to bacterial overgrowth in your small intestine which may cause bloating, gas, abdominal pain, constipation and diarrhoea." They said. Many beers are also high in gluten, as well as, well, bubbles. Wine and chapagne also have a fairly high sugar content. All kinds of alcohol are known to cause dehydration.