Educational Guide

What Does ALT (Alanine Aminotransferase) Mean?

ALT is a liver enzyme that leaks into the blood when liver cells are stressed or damaged. Mild elevations are common and often relate to fatty liver, alcohol, or medications.

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What ALT (Alanine Aminotransferase) Measures

ALT is an enzyme found mostly inside liver cells. Damaged or stressed liver cells release ALT into the bloodstream, so elevated ALT is one of the most sensitive markers of liver injury. Mild elevations are common and don't always indicate serious disease.

Normal Ranges

Normal (men)7–55 U/L
Normal (women)7–45 U/L
Mildly elevated1–3× upper limit
Significantly elevated> 3× upper limit

Reference ranges may vary slightly by lab. Always use the range provided on your specific test report.

What Affects Your ALT (Alanine Aminotransferase) Level

  • Non-alcoholic fatty liver disease (most common cause of mild elevation)
  • Alcohol intake
  • Certain medications (acetaminophen, statins, antibiotics)
  • Viral hepatitis (A, B, C)
  • Obesity and metabolic syndrome
  • Intense exercise (transient rise)

Foods That May Help

Coffee (2–3 cups/day)

Repeatedly shown to lower ALT and reduce fatty liver

Leafy greens (spinach, kale)

Support glutathione, the liver's detox antioxidant

Olive oil

Reduces liver fat in non-alcoholic fatty liver disease

Fatty fish

Omega-3s reduce liver fat and inflammation

Beets and artichokes

Traditional liver-supportive foods rich in antioxidants

When to See Your Doctor

ALT elevated 2–3× upper limit warrants follow-up testing. Persistent elevations or values above 3× upper limit usually require a full liver workup — viral hepatitis screening, ultrasound, and review of medications and alcohol use.

Related Biomarkers

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Educational content only · Not medical advice