Liver and metabolic health
How to Lower Your ALT: What Actually Works
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed August 20266 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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ALT is a liver enzyme that rises when liver cells are under strain. In the UK the most common driver of a mildly raised ALT is fat in the liver. Losing excess weight, cutting alcohol and moving more are the levers that shift it. Retest after about 12 weeks.
Want to see your own number? Build your test →A mildly raised ALT is one of the most common flagged results on a blood panel. It is also one of the most responsive. The number moves with weight, alcohol and daily habits rather than with luck.
This guide covers the changes with real evidence behind them, what UK guidance says, how long liver enzymes take to settle, and how to check whether your effort worked.
1. What does a raised ALT actually mean?
ALT stands for alanine aminotransferase. It is an enzyme that sits inside liver cells. When those cells are irritated, a little more of it leaks into the blood. So ALT is a strain signal, not a diagnosis. Our ALT blood test guide covers the test itself and the UK ranges in full.
Most UK laboratories report a normal ALT as roughly up to 40 to 50 U/L, often with a slightly lower upper limit for women. The exact cut-off depends on the lab, so read your result against the range printed on your own report.
The usual driver of a mild rise is fat in the liver, known as non-alcoholic fatty liver disease. Alcohol, some medicines, recent hard training and a recent viral illness can lift it too. The NHS is blunt about where the fix lives.
“If you have non-alcoholic fatty liver disease, apart from making healthy lifestyle changes you will not need any other treatment.”
— NHS, Non-alcoholic fatty liver disease
One caveat before the levers. A markedly raised ALT, many times above the range, is a GP conversation rather than a lifestyle project. So is any result that comes with yellowing skin, dark urine or ongoing pain under the right ribs.
2. What actually lowers ALT?
Four levers do nearly all the work. None of them is a supplement.
- Lose excess weight, gradually. This is the biggest lever by some distance. In a 2015 study of 293 people published in Gastroenterology, everyone who lost at least 10 percent of their body weight improved on liver biopsy.
- Cut back on alcohol. The NHS limit is 14 units a week, spread over three or more days. Several drink-free days in a row give the liver a genuine break.
- Move more, most days. NHS guidance is at least 150 minutes of moderate activity a week. Exercise lowers liver fat even when the scales barely move.
- Fix the blood sugar side. Liver fat travels with insulin resistance, so sugary drinks and refined carbs feed both. Our guide to lowering HbA1c covers that half.
NICE guideline NG49 points the same way. Diet and activity together beat either one alone, and there is no pill that replaces them.
Two things to be careful with. Very fast weight loss can raise liver enzymes for a while, so steady beats crash. And some herbal products are themselves a cause of raised enzymes, which our guide to herbal supplements and the liver goes through.
Never stop a prescribed medicine because of a blood result. If you suspect a medicine is behind your number, that is a conversation with the clinician who prescribed it.
3. How long does ALT take to come down?
Faster than most blood markers. ALT reflects what your liver is doing now, not a three-month average. Cut alcohol and the number often starts falling within weeks.
Weight-driven change is slower, because the fat has to come out of the liver first. Most people who lose weight steadily see ALT settle over roughly two to three months.
That sets the testing rhythm. Test now, work the levers, then retest after about 12 weeks under the same conditions. Testing a fortnight later mostly measures noise.
One honest limit. ALT can read normal even when there is fat in the liver, so a good number is reassurance rather than an all-clear. That is why it is read alongside other markers, not alone.
4. Is it working? Measure it
A before-and-after test turns three months of effort into something you can see. Read ALT with the markers that move with it:
- ALT and ALP, the liver enzymes themselves.
- Triglycerides and non-HDL cholesterol, blood fats that usually improve alongside a fatty liver. Our cholesterol blood test guide explains those numbers.
- Kidney and thyroid markers, because a thyroid that is running slow can nudge liver enzymes and blood fats in the same direction.
Helvy's Thyroid & Vital Organs panel measures ALT alongside ALP, the kidney markers, the full cholesterol profile and thyroid, in one home finger-prick test. Results come from UKAS-accredited UK laboratories. Prefer to pick your own markers? Build a custom test instead.
If you want the wider view first, our liver function test guide explains every enzyme on a standard liver panel and what each one adds.
READY TO TEST?
See whether your changes reached your liver
Test your ALT now, work the levers for 12 weeks, then test again. Helvy's home finger-prick panels measure liver enzymes with the markers that travel with them, so you see your own response rather than guessing.
Frequently asked questions
How quickly can ALT come down?
It depends on the driver. When alcohol is the main factor, ALT often starts falling within a few weeks of cutting back. When liver fat is the driver, allow two to three months of steady weight loss. Retesting after about 12 weeks gives the change time to show.
Can you lower ALT without medication?
For the common causes, that is the main route. The NHS says people with non-alcoholic fatty liver disease need healthy lifestyle changes rather than other treatment. Weight loss, less alcohol and regular activity carry most of the effect. Anything unusual or markedly raised belongs with your GP.
Does exercise lower ALT?
Regular activity lowers liver fat, and liver enzymes usually follow. NHS guidance is at least 150 minutes of moderate activity a week. One warning: a single very hard session can push ALT up briefly, so avoid heavy training the day before a test.
Which foods help lower ALT?
No single food does it. What helps is the overall pattern: fewer sugary drinks, less refined carbohydrate and alcohol, more vegetables, fibre and protein. That pattern lowers liver fat, and the enzyme follows the fat rather than any one ingredient.
Which blood test shows if my ALT is improving?
A liver panel taken before and after about 12 weeks, under the same conditions both times. Reading ALT alongside cholesterol and thyroid markers gives the fuller picture. Helvy's Thyroid & Vital Organs panel measures those in one home finger-prick test.
Related guides
ALT Blood Test UK
What ALT measures, normal UK ranges, and what a raised result means.
Fatty Liver Blood Test
The markers that point towards fat in the liver, and their limits.
Liver Enzyme Levels by Age
How ALT, ALP and GGT shift across the decades in UK adults.
GGT Blood Test UK
The enzyme that responds most to alcohol, and how to read it.