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LFT Interpretation: AST, ALT, ALP, GGT, Bilirubin & Albumin

A short, accurate overview of common liver function tests and what they measure, with a focus on how diet and lifestyle relate to these labs.

Evidence Based Editorial Team: NutritionColours Editorial Team

Overview

“Liver function tests” (LFTs) are a standard blood panel that includes several distinct markers. AST and ALT are enzymes released when liver cells are damaged or inflamed; ALP and GGT rise mainly with bile duct or bile flow problems (cholestasis); bilirubin reflects how well the liver processes the breakdown products of red blood cells (elevated levels cause jaundice); and albumin, along with prothrombin time (PT/INR), reflects the liver’s protein-making and clotting-factor synthesis capacity — a marker of overall liver function rather than just cell injury. A physician interprets the pattern of these results together, not any single number in isolation, to determine whether a problem looks like liver-cell damage (hepatocellular), bile-flow blockage (cholestatic), or a mix of both.

Why This Matters for Nutrition

Several LFT markers are directly influenced by diet and lifestyle. Alcohol intake, rapid weight changes, high-sugar or high-fat diets linked to fatty liver, and even severe malnutrition (which lowers albumin) can all move these numbers. This is why LFTs are often used to monitor progress when someone changes their diet for a liver-related condition like NAFLD, and why registered dietitians and physicians often review these labs together when building a nutrition plan.

Safety Note

LFT results should always be interpreted by a physician in the context of a person’s full clinical picture, not compared to generic reference ranges found online. This overview does not provide diagnostic thresholds or targets.

Frequently Asked Questions

Q1: Can diet changes improve liver enzyme levels?

A1: In some conditions, particularly NAFLD, sustained weight loss and dietary changes can improve elevated liver enzymes over time. Any expectation about timeline or degree of improvement should come from the treating physician.

Q2: Why is albumin included in liver testing?

A2: Albumin is a protein made almost exclusively by the liver, so low levels can reflect impaired liver synthetic function — though low albumin can also result from poor nutrition or other illnesses, so it’s interpreted alongside other tests.

Q3: Who should interpret my liver function test results?

A3: A physician should interpret LFT results in the context of your full history and other tests. Please don’t self-diagnose based on isolated lab values.

[!IMPORTANT] This content is educational and does not replace individualized medical advice. Please consult a qualified healthcare provider to interpret lab results.