Why does alcohol always leave you thirsty? The science behind the dry mouth

Alcohol has a habit of leaving the body drier than it started. By interfering with hormones that regulate water balance, it increases fluid loss even as it’s being consumed, while its breakdown in the liver adds further strain. The result is thirst, headaches and fatigue that feel familiar to anyone who’s overdone it. Understanding the biology helps explain why simple measures, food, water and time, make a real difference.