Why Fit People Get Flagged Liver Numbers

It is one of the more uncomfortable findings in the category: people who train hard and eat carefully still turn up with flagged liver enzymes, sometimes while the colleague who does neither comes back clean.

The instinct is to assume a lab error. Hard training genuinely can nudge AST, which is also released by muscle, so a retest after a rest week is always worth doing. But when the number holds, there is a mechanism worth understanding.

Two different fats, two different processes

Exercise is very good at mobilising fat stored in muscle and under the skin. Fat stored inside liver tissue leaves by a different route entirely: the liver has to package it into a transport particle and ship it out through the bloodstream.

The body builds that packaging largely from choline. Without the material, the packaging does not get built, and the fat stays put — regardless of body fat percentage, weekly mileage or how clean the macros are.

Where the gap usually comes from

The richest dietary sources of choline are egg yolks, liver and red meat. They are also, almost without exception, the first three foods cut when somebody decides to eat properly. Years of egg-white omelettes, whey in place of whole food and red meat twice a month can leave a diet that scores well on every number being tracked and supplies very little of this one.

Nothing on a typical supplement shelf covers it either. Whey, creatine, a multivitamin, magnesium and fish oil are all aimed at performance and recovery. None of them touches a liver pathway.

Four jobs, not one

Milk thistle protects liver cells, which is real and useful, and it is one job out of four. The others are rebuilding glutathione from NAC, moving fat out with choline, and draining what gets broken down through bile with dandelion and artichoke. Cover one and the other three carry on unattended.

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General health information, not medical advice. Abnormal liver chemistry should always be evaluated by a doctor.

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