Protecting your liver comes down to a handful of consistent habits: limiting alcohol, reducing sugar intake, staying physically active, watching what medications you take, and avoiding environmental toxins. The liver handles over 500 functions, from filtering blood to processing nutrients, and it’s remarkably good at regenerating, but chronic damage from any of these sources can eventually outpace its ability to repair itself.
Limit Alcohol or Cut It Out
Alcohol is the most well-known liver threat, and the damage is dose-dependent. The National Institute on Alcohol Abuse and Alcoholism defines heavy drinking as 4 or more drinks on any day (or 8 or more per week) for women, and 5 or more on any day (or 15 or more per week) for men. A standard drink contains about 14 grams of pure ethanol, which works out to 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of distilled spirits.
Staying within moderate limits, or avoiding alcohol altogether, is the single most impactful thing you can do for your liver. Even amounts that feel “normal” can contribute to fatty liver and inflammation over years if they consistently fall into the heavy-drinking range. The liver processes almost all the alcohol you consume, and when its capacity is overwhelmed, toxic byproducts accumulate and damage liver cells directly.
Cut Back on Added Sugar, Especially Fructose
Fatty liver disease isn’t just an alcohol problem. The condition formerly known as nonalcoholic fatty liver disease, now called metabolic dysfunction-associated steatotic liver disease (MASLD), affects roughly 1 in 3 adults and is closely tied to diet and metabolic health. It’s linked to excess body weight, high blood sugar, high blood pressure, and abnormal cholesterol levels.
Fructose is a particular concern. Unlike glucose, which is used by cells throughout the body, fructose is almost entirely processed in the liver. When you consume large amounts, the liver ramps up its fat-producing machinery far more aggressively than it does with other sugars. This process turns excess fructose into fat that gets stored directly in liver tissue. A controlled trial published in the Journal of Hepatology confirmed that fructose-sweetened and sucrose-sweetened beverages promote this liver fat production, while glucose-sweetened beverages do not to the same degree.
The practical takeaway: sodas, fruit juices, sweetened teas, and processed foods with high-fructose corn syrup are the biggest dietary contributors to liver fat accumulation. Whole fruit, despite containing fructose, delivers it in much smaller amounts alongside fiber that slows absorption.
Exercise Regularly
Aerobic exercise is the most time-efficient way to reduce liver fat. A study in the American Journal of Physiology found that moderate aerobic exercise (equivalent to about 12 miles of walking or jogging per week at a brisk pace) significantly reduced liver fat, visceral fat, and markers of liver stress in overweight adults. Resistance training improved body composition but didn’t match aerobic exercise for liver-specific benefits.
You don’t need to run marathons. Roughly 150 minutes per week of moderate-intensity activity, spread across most days, is enough to make a measurable difference. Brisk walking, cycling, swimming, or any activity that raises your heart rate counts. The key is consistency over weeks and months, not intensity on any single day.
Be Careful With Acetaminophen
Acetaminophen (the active ingredient in Tylenol and many cold and flu medications) is safe at recommended doses, but it has a narrower margin of safety than most people realize. Your liver converts a small percentage of each dose into a toxic byproduct called NAPQI. At normal doses, your body neutralizes NAPQI quickly. At high doses, the neutralizing system gets overwhelmed, and NAPQI starts destroying liver cells.
The threshold for serious liver damage is around 10 to 15 grams in a 24-hour period for adults, which is roughly 20 to 30 extra-strength tablets. That sounds like a lot, but accidental overdoses happen more often than intentional ones, usually because people take multiple products containing acetaminophen without realizing it. Cold medicines, sleep aids, and prescription painkillers frequently contain it. Always check labels and keep your total daily intake well within the recommended maximum. Combining acetaminophen with alcohol increases the risk substantially, because alcohol activates the same liver enzyme that produces NAPQI.
Get Vaccinated Against Hepatitis
Hepatitis A and B are viral infections that directly attack liver cells. Both are preventable with vaccines. Hepatitis B vaccination for adults typically requires two or three doses depending on the specific vaccine, spaced over several months. Hepatitis A vaccination follows a similar multi-dose schedule. If you were born before universal childhood vaccination programs began (the early 1990s for hepatitis B, the late 1990s for hepatitis A), you may not have received either. Your doctor can check your immunity with a simple blood test and catch you up if needed.
Hepatitis C, which causes more chronic liver damage than A or B combined, has no vaccine but is now curable with antiviral treatment. If you were born between 1945 and 1965, or have other risk factors, screening is recommended.
Get Enough Choline
Choline is a nutrient most people have never heard of, yet it plays a direct role in preventing liver fat buildup. Your liver needs choline to package fat into particles that can be exported into the bloodstream. Without enough choline, fat accumulates in the liver, leading to the same kind of fatty liver disease caused by excess sugar or alcohol.
The adequate daily intake is 550 mg for men and 425 mg for women. Eggs are the richest common source, with one large egg providing about 150 mg. Beef liver, chicken, fish, and soybeans are other good sources. Many people, particularly those who avoid eggs and meat, fall short of these targets without realizing it.
Reduce Exposure to Environmental Toxins
A class of synthetic chemicals called PFAS, sometimes called “forever chemicals” because they don’t break down in the environment, has been linked to liver damage. A review of 111 studies by NIH researchers found that three PFAS chemicals commonly detected in human blood were all associated with elevated liver enzymes, a marker of liver cell injury.
PFAS are found in nonstick cookware, water-resistant clothing, food packaging, stain-resistant fabrics, and some municipal water supplies. You can reduce your exposure by using stainless steel or cast iron cookware instead of nonstick, filtering your drinking water with a reverse osmosis or activated carbon system rated for PFAS removal, and avoiding fast-food wrappers and microwave popcorn bags when possible. These steps won’t eliminate exposure entirely, since PFAS are widespread in the environment, but they reduce the ongoing load your liver has to deal with.
What About Milk Thistle and Supplements?
Milk thistle (specifically its active compound silymarin) is the most studied liver supplement. It has demonstrated some ability to reduce liver enzymes in people with alcoholic liver disease and chronic viral hepatitis, and one clinical trial found that a nutraceutical blend containing milk thistle significantly lowered multiple liver enzyme markers compared to placebo over the study period. However, the improvements in that trial were modest, and the supplement combined milk thistle with turmeric, dandelion, and ginger, making it hard to isolate which ingredient drove the results.
Milk thistle is generally safe and unlikely to cause harm, but it’s not a substitute for the lifestyle factors above. No supplement can overcome a pattern of heavy drinking, a high-sugar diet, or a sedentary lifestyle. If you’re already doing the basics well and want to add milk thistle, it’s a reasonable choice, but treat it as a small addition rather than a primary strategy.