“Participants testify to how great a month off from alcohol can be; they sleep better, have more energy, some lose weight and save money, and others notice improvements in their skin and hair.
More recently, research from the Royal Free Hospital in London2 has shown that there are positive physiological effects to be gained from taking part in Dry January. The study, performed on moderate drinkers (those drinking around the levels of recommended limits), has shown people experiencing improvements in concentration and sleep patterns, as well as having reduced cholesterol and lower glucose levels, lower blood pressure, weight loss overall, and losing 40% of their liver fat.”
National Library of Medicine NIH