"Alcohol is a diuretic, which means it causes water to leave your body, thus dehydrating your skin," Rabach says. "When your skin is dehydrated, it loses plumpness, and fine lines and wrinkles become more apparent." Alcohol also reduces antioxidants in the skin, particularly vitamin A, which helps with cell renewal and turnover. A lack of this essential compound inhibits your body's natural ability to ward off free-radical damage and protect your skin from environmental stressors.
What's more, "alcohol is pro-inflammatory, meaning it can cause flares in certain inflammatory skin conditions like acne, rosacea, and psoriasis," she adds. This is partly due to the fact that alcohol causes vasodilation, which is the widening of blood vessels. This increases redness and flushing and can even give rise to facial spider veins and a puffy complexion.