Elevated Liver Enzymes and Fatty Liver: What Diet, Lifestyle and Supplements Can Do

A routine blood test comes back with a flag next to a number you have never paid attention to. The abbreviation is ALT or AST. You feel mostly fine. The appointment is over in a few minutes. The number says that something is putting liver cells under strain. It does not say what.

What do elevated liver enzymes mean?

Elevated liver enzymes mean that liver cells are releasing more of certain enzymes into the blood than usual, which signals strain on the liver without naming the cause. ALT (alanine aminotransferase) and AST (aspartate aminotransferase) are the two markers ordered most often, usually together with alkaline phosphatase and bilirubin.

The American College of Gastroenterology guideline puts a healthy normal ALT at 29 to 33 IU/L for men and 19 to 25 IU/L for women. It says levels above that should be assessed. The guideline also notes that multiple studies link a raised ALT to a higher risk of liver-related death, which is why a mildly raised value deserves a follow-up.

When ALT and AST are raised, doctors work through several groups of possible causes:

Because several of these causes can look the same on a first blood test, a raised value is a reason to investigate rather than a diagnosis.

What is fatty liver disease and why is it now called MASLD?

Fatty liver disease means that fat makes up an abnormal share of the liver, a state doctors call steatosis. In 2023 a panel of liver societies renamed the most common form from NAFLD to MASLD, short for metabolic dysfunction-associated steatotic liver disease.

The panel included 236 experts from 56 countries. They found the word "fatty" stigmatizing (66% of respondents) and the word "nonalcoholic" stigmatizing (61%), so both were dropped. The new definition requires fat in the liver plus at least one cardiometabolic risk factor, such as excess weight, raised blood sugar, high blood pressure or abnormal blood fats. A separate category called MetALD describes people with metabolic dysfunction who also drink more alcohol: 140 to 350 grams a week for women and 210 to 420 grams a week for men.

The condition is common. A meta-analysis of 86 studies with more than 8.5 million people in 22 countries put the global prevalence of NAFLD at 25.24%, roughly one adult in four. Among people with NAFLD, 51.34% had obesity, 22.51% had type 2 diabetes and 42.54% had metabolic syndrome. That pattern explains why many people with fatty liver drink little or no alcohol: the main drivers are metabolic.

How much does weight loss change a fatty liver?

Weight loss is the best-documented lever: in a 52-week study of 293 adults with biopsy-proven NASH (nonalcoholic steatohepatitis, which means fat in the liver together with inflammation and cell injury), the more weight people lost, the more their liver biopsies improved.

Of the 88 participants who lost at least 5% of their body weight, 58% had resolution of steatohepatitis. Everyone who lost 10% or more showed a lower NAFLD activity score, 90% had resolution of steatohepatitis and 45% showed regression of fibrosis (liver scarring). Across all 293 participants, 25% reached resolution of steatohepatitis.

The study followed one group of patients over time instead of comparing them with a control group, so it shows an association between weight loss and biopsy results rather than a guarantee. It also shows how demanding the target is: only 30% of participants reached a 5% weight loss within a year.

Which eating pattern has the best evidence for fatty liver?

A Mediterranean-style diet has the clearest trial evidence among eating patterns: in a small randomized crossover trial it produced a relative reduction in liver fat of 39% in six weeks, compared with 7% on a low-fat, high-carbohydrate diet.

The trial enrolled 12 adults with biopsy-proven NAFLD, who followed each diet for six weeks in random order. Weight loss did not differ between the two diets, so the difference in liver fat did not come from weight. Insulin sensitivity improved on the Mediterranean diet and did not change on the control diet. Twelve participants is a small group, so the authors call for further research.

A Mediterranean pattern centers on olive oil as the main fat, vegetables, legumes, whole grains, fish and nuts, with little processed meat and few sugary products. It is also a diet most people can keep up for years, which matters because the liver responds to what you do over months.

Does exercise help the liver even without weight loss?

Exercise lowers liver fat even when body weight barely changes: a meta-analysis of 12 controlled trials found a significant pooled benefit of regular aerobic or resistance exercise on liver fat, with the benefit appearing at minimal or no weight loss.

The pooled benefit became significant after the analysis set aside trials that compared exercise plus diet with diet alone and produced substantial weight loss. The same analysis found no effect of exercise alone on ALT. A blood value that stays put after a few weeks of workouts therefore does not mean the exercise did nothing, because liver fat and liver enzymes do not always move together. The authors also noted that the benefit appeared at exercise levels below standard weight-management recommendations, so a modest but regular routine counts.

Can supplements lower liver enzymes?

Some supplements have lowered ALT and AST in small randomized trials, but the evidence is early and no supplement replaces weight management, diet and medical follow-up. The table summarizes three plant ingredients that have been studied in fatty liver.

Trials use different extracts and doses, which makes results hard to compare. They usually run for weeks rather than years. Such figures describe the ingredients in the studied preparations. They do not predict what any particular product will do.

Can a supplement make liver problems worse?

Yes, some can: in the US Drug-Induced Liver Injury Network, the share of liver injury cases attributed to herbal and dietary supplements rose from 7% to 20% between 2004 and 2013. The network collects cases from eight specialist referral centers, so the figure describes injury cases and not how often injury occurs among supplement users.

The practical lessons are simple:

• Tell your doctor about every supplement, since the guideline asks clinicians to take a history of prescribed and over-the-counter medicines when liver enzymes are raised.
• Start one product at a time so that any change can be traced.
• Be cautious with concentrated extracts and with any product that promises quick liver results.
• Stop the product and call your doctor if you notice yellowing of the skin or eyes, dark urine or persistent itching.

How naturaveda approaches liver support

naturaveda hepavital is a food supplement formulated to support liver function, designed to sit alongside diet, movement and medical follow-up and not to replace them. One daily portion of two capsules contains:

• Turmeric powder, 300 mg
• L-glycine, 200 mg
• Dandelion root powder, 100 mg
• Milk thistle seed extract, 50 mg
• Artichoke leaf extract, 50 mg
• Ginger root powder, 50 mg
• Black pepper extract, 5 mg

The capsule shell is HPMC, a plant-based material. The product is vegan, gluten-free and lactose-free. One bottle holds 60 capsules, which covers 30 days. Milk thistle, turmeric and artichoke are the plants from the table above. Dandelion root and ginger are traditional herbs. L-glycine is an amino acid that the body uses as one of the building blocks of glutathione, an antioxidant the liver makes for itself.

The formula contains turmeric and black pepper extract. People who take prescription medicines or have a diagnosed liver condition should show the label to their doctor or pharmacist before starting.

When should you see a doctor?

See a doctor promptly if raised liver numbers come with any of these warning signs:

• Yellowing of the skin or the whites of the eyes
• Swelling in the abdomen or legs
• Persistent pain in the upper right abdomen
• Dark urine or pale stools
• Unexplained weight loss
• Vomiting blood or black, tarry stools

Make an appointment even without symptoms if ALT or AST stay raised on repeat testing, if you have been told you have hepatitis or cirrhosis, or if you take statins, blood thinners or immunosuppressants and want to add a supplement. Fatty liver often causes no symptoms at all, so the blood test is frequently the only warning.