Alcohol is one of the most common causes of abnormal liver values. Your liver breaks down alcohol, and with regular or heavy drinking that process becomes overloaded. Gamma-GT in particular then rises, often the first of all liver values.
Below you will read how alcohol affects your values, how much is too much, and how quickly your liver recovers when you cut back.
How does alcohol affect your liver values?
Breaking down alcohol produces substances that irritate and eventually damage liver cells. As a result, liver enzymes leak into your blood. A typical alcohol pattern is recognised by an elevated gamma-GT and an ASAT clearly higher than ALAT, often an ASAT/ALAT ratio above 2 (Botros & Sikaris, 2013).
Which liver value reacts first to alcohol?
Gamma-GT is the most sensitive and usually rises first, even before ALAT or ASAT respond. That makes it an early gauge. An isolated elevated gamma-GT, without other abnormalities, therefore often points to alcohol.
An elevated gamma-GT is also associated in large studies with a higher risk of cardiovascular disease, independent of the liver (Ruttmann et al., 2005). One more reason to pay attention to it.
How much alcohol is too much for your liver?
Dutch nutrition guidance advises no alcohol or at most one glass per day. For the liver: less is always better. It is not only about quantity, but also regularity: daily drinking strains the liver more than occasional use.
Do your liver values recover after stopping alcohol?
Yes, often surprisingly well. After a period without alcohol, gamma-GT usually drops within 2 to 4 weeks. An alcohol-free month shows the effect clearly and is a simple way to test whether alcohol was the cause.
From alcohol to fatty liver and worse
Long-term heavy drinking can lead to alcoholic fatty liver, inflammation and eventually cirrhosis. The early stages are often still reversible. Read more in our article on fatty liver disease.
Want to have your liver values checked? The Vital Check liver function test measures your gamma-GT, ALAT and ASAT, with review by a doctor.
Frequently asked questions
How long should I avoid alcohol before a liver value test?
Avoid alcohol for at least 48 hours before the blood draw for a reliable baseline. To see the effect of cutting back, a longer alcohol-free period of a few weeks is more useful.
Can one evening of drinking raise my liver values?
A heavy evening can temporarily raise gamma-GT. In most people that clears within a few days. If it stays elevated, your liver may be more sensitive.
Are my liver values normal if I drink little?
Not automatically. Even without alcohol, liver values can deviate, for example from fatty liver or medications. Alcohol is a common, but not the only, cause.
References
- Botros M, Sikaris KA. The de Ritis ratio: the test of time. Clinical Biochemist Reviews. 2013. PubMed
- Ruttmann E, et al. Gamma-glutamyltransferase as a risk factor for cardiovascular disease mortality. Circulation. 2005. PubMed
- Younossi ZM, et al. Global epidemiology of nonalcoholic fatty liver disease - meta-analytic assessment of prevalence, incidence, and outcomes. Hepatology. 2016. PubMed
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