How does alcohol affect liver enzyme levels?

Alcohol raises liver enzyme levels because it damages liver cells and triggers inflammation. The most commonly measured enzymes are ALT, AST, GGT, and ALP.

ALT and AST climb within days of heavy drinking and can stay elevated for weeks after stopping. AST often rises more than ALT, producing the classic AST/ALT ratio greater than 2:1 that points toward alcoholic liver injury.

GGT is especially sensitive; even moderate intake can push it above normal, and it drops faster once alcohol is removed. ALP tends to rise only when alcohol-related damage reaches the bile ducts or when cholestasis develops.

Chronic use sustains these elevations and can progress to fatty liver, hepatitis, or cirrhosis. In people with existing liver disease, even small amounts of alcohol can cause sharp enzyme spikes and speed up scarring.

Labs usually return to normal within four to eight weeks of abstinence, but persistent elevations signal ongoing injury or another cause that needs investigation.