The Marker You're Missing: GGT
The liver enzyme that says more than you'd think
Levels <[email protected]>
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Levels promotes understanding of the liver enzyme GGT, highlighting its role in tracking broader metabolic health beyond liver function. The company explains what GGT is, why it matters, and how everyday habits can impact its levels. Levels also invites readers to explore their health news and advice site, Metabolic Insights, for more information on metabolic health.
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The Marker You're Missing: GGT
The liver enzyme that tracks more than your liver
GGT shows up on many standard liver panels, usually next to the more familiar ALT and AST, and it's easy to assume it only matters if something is wrong with your liver. But this enzyme helps manage glutathione, one of your body's main antioxidants, and its level in your blood turns out to reflect a lot about your broader metabolic health. It's also one of the markers most responsive to everyday habits, which makes it a useful way to see whether the changes you're making are showing up inside your body.
Button More than a liver test →
The Basics
What it is
Gamma-glutamyl transferase is an enzyme found mostly in the liver and bile ducts. When liver cells are under stress or bile flow is blocked, more of it spills into your bloodstream.
Why it matters
In large population studies, higher GGT, even toward the upper end of the normal range, is associated with greater risk of heart disease, type 2 diabetes, and metabolic syndrome. It can also rise before other liver enzymes do, including in early fatty liver.
Healthy range
Reference ranges vary by lab, sex, and age, so go by the range on your own report. In general, values in the lower part of the normal range are associated with lower risk.
What moves it
Alcohol is the biggest everyday driver. GGT is sensitive enough to drinking that it's used to monitor it. Excess belly fat, ultra-processed foods and added sugar, smoking, and some medications can also raise it, while weight loss, a Mediterranean-style diet, and coffee are associated with lower levels.
When to test
It's included in many liver panels, so check whether it's on your last results. Skip alcohol and intense exercise for at least a day beforehand, since both can temporarily push it up.
Button Read our full guide to GGT →
Looking to understand more about your metabolic health?
Explore our health news and advice site, Metabolic Insights
228 Park Ave South, PMB 63877, New York, NY 10003
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