New research shows how alcohol harms your liver. Scientists have found that drinking alcohol can weaken the gut’s natural defenses. Normally, your gut keeps harmful bacteria where they belong, but alcohol can “switch off” this protection. When that happens, these bacteria can travel to the liver and cause inflammation and damage — a major cause of alcohol-related liver disease (ALD).
Researchers at the University of California San Diego have discovered how long-term alcohol use harms the liver — and, importantly, they’ve found that this damage can be reversed with the right therapies and care. Continue reading to learn more about how alcohol damages the liver and ways you can work to reverse this issue.
What Is Alcohol-Associated Liver Disease (ALD)?
Alcohol-associated liver disease (ALD) is a major cause of chronic liver disease worldwide, and comprises a spectrum of several different disorders, including simple steatosis, steatohepatitis, cirrhosis, and superimposed hepatocellular carcinoma [1].
A Possible Cause of Alcohol-Associated Liver Disease: UC San Diego Research
UC San Diego researchers have found evidence for one way of how alcohol damages the liver in the long term. More significantly, they’ve found that this damage may be reversible. Their findings could lead to new, targeted therapies for alcohol-associated liver disease, a serious condition responsible for about 28,000 deaths each year in the United States.
ALD is one of the most severe health problems linked to heavy drinking. Over the last 20 years, deaths caused by alcohol-related liver disease have almost doubled around the world.
Until recently, the only proven way to slow or stop the disease was to completely stop drinking alcohol, since doctors did not fully understand what caused the liver damage.
Now, new research is helping scientists better understand how ALD develops. This progress gives both doctors and patients hope that future therapies could not only prevent further damage but may also help the liver heal and recover.
Understanding the Gut-Liver Connection
Your gut and liver are more connected than you might think. The gut acts as the body’s first line of defense, controlling what passes into your bloodstream. The liver, in turn, filters and processes substances coming from the gut.
When this communication breaks down, harmful bacteria and toxins can reach the liver and trigger inflammation — a key driver of alcohol-associated liver disease. The body’s Detoxification circuit of NeuroEndoMetabolic (NEM) Stress Response becomes affected and cannot function normally to help rid the body of toxins.
The Body’s Natural Gut “Security System”
Inside the gut, special receptors help maintain balance and protect against infection. One of these receptors, called mAChR4 (muscarinic acetylcholine receptor M4), plays a vital role in keeping the gut barrier strong.
Under normal conditions, mAChR4 tells goblet cells — cells that produce protective mucus — to build small checkpoints called GAPs (goblet-cell-associated antigen passages).
These GAPs allow your body’s immune system to safely monitor your gut bacteria and prevent them from leaking into your bloodstream.
How Alcohol Interferes with Your Gut “Security System”
Research findings indicate that in people who experience alcohol-associated liver disease, mAChR4 receptor activity drops drastically. The results of this receptor ceasing to carry out its functions include:
- Goblet cells stop producing GAPs.
- Bad bacteria permeate the gut barrier.
- Bacteria move to the liver, where they cause inflammation, fat accumulation, and tissue breakdown.
- In findings of animal studies that imitate continued alcohol use, the resulting effects were identical: inhibited mAChR4, bacterial penetration, and liver damage [2].
In essence, alcohol stops the gut’s border control system from functioning, causing bacteria to slip into the liver and resulting in harmful effects.
What This Means for Liver Care
While this research is promising for developing therapies that could potentially target mAChR4 or prevent bacterial transmission, it could be years before they are available.
In the meantime, it’s important to understand other ways alcohol damages the liver and what you can do to stop the damage now.
Other Ways Alcohol Can Cause Damage to Your Liver
Alcohol can also damage your liver in other ways.
The liver acts as your body’s primary “filter,” where it breaks down alcohol and eliminates toxins from the body. However, drinking in excess or too frequently can burden this system and begin to harm liver cells. Gradually, the minor injuries to your liver cells can develop into serious liver disease.
Buildup of Toxin
The process of the liver breaking down alcohol causes the body to produce a harmful chemical known as acetaldehyde.
Also, it further releases other toxins called free radicals. These toxins damage your liver cells, impede DNA and proteins, and lead to inflammation as well as cell death.
Fatty Liver/Steatosis
Fat accumulation in the liver is typically the first stage of alcohol-related damage. Alcohol has the capacity to modify your liver’s chemistry. This can cause it to hold additional fat, reduce the amount of fat it burns, and draw fatty acids into the liver from the blood.
At this stage, if you quit drinking early, you can reverse the effects.
Inflammation and Immune Attack
Alcohol also irritates the gut, allowing bacteria and toxins to leak into the bloodstream and reach the liver. This triggers the immune system, which releases inflammatory chemicals like TNF-α and IL-6.
When this happens, the liver swells, pain emerges, and the liver injury worsens [3].
Scarring
At the point where repeated injury and inflammation occur, the liver will attempt to heal itself via scar tissue.
But in the long run, scarring takes the place of healthy liver cells, resulting in fibrosis, which refers to early scarring, and cirrhosis, which refers to severe, permanent scarring [4].
Cirrhosis can lead to blocked blood flow through your liver and can result in liver failure or cancer.
Risk Factors Associated With How Alcohol Damages the Liver
Alcohol-associated liver problems can develop due to several factors:
- Alcohol consumption: Consuming a lot of alcohol over a long period increases your risk of liver damage. Drinking even moderate amounts of alcohol can be a factor in the development of fatty liver.
- Sex: Women are more susceptible to alcohol-related liver damage than men.
- Obesity: Excess body weight increases the chance of liver injury from alcohol.
- Chronic infections: Hepatitis B or C can worsen alcohol-related liver damage.
- Genetics: Your genes can affect how your body processes alcohol and influence your risk for liver disease or alcohol use disorder.
How Alcohol Damages the Liver: Early Signs of Alcohol-Related Liver Damage
In the early/moderate stages of alcohol-induced liver damage, many people notice no symptoms at all. However, some experience the following symptoms:
- Fatigue and weakness
- Loss of appetite and unintended weight loss
- Nausea, feeling sick, or vomiting
- Upper right abdominal pain or discomfort
- Abdominal swelling (in moderate cases)
- Feeling generally unwell
- Skin changes (e.g. small red spider-like vessels)
You should make an appointment as soon as possible if you notice any of these symptoms:
- Jaundice (yellowing of the skin or eyes)
- Abdominal pain or swelling
- Swelling in the legs or ankles
- Persistent digestive issues
- Dark urine or pale stools
- Easily bruising or bleeding
Stages of Alcohol-Related Liver Disease
Alcohol-related liver disease usually develops in stages, becoming more serious over time:
1) Fatty Liver (Steatosis)
Fatty Liver is the earliest stage. Drinking more alcohol than your liver can process causes fat to build up in liver cells. At this point, the liver may still function normally, and the damage can often be reversed if alcohol use stops.
Essentially, your liver starts storing extra fat, like a factory overloaded with boxes. It can still work, and if you stop drinking, it often recovers fully.
2) Alcoholic Hepatitis
Continued alcohol use can lead to inflammation of the liver. This stage, called alcoholic hepatitis, damages liver cells and can cause symptoms like fatigue, nausea, and jaundice.
In essence, the liver becomes inflamed, like machines in the factory overheating. This inflammation can lead to you feeling unwell, and if the inflammation occurs repeatedly, real damage can set in.
Here, the combination of proper care and not consuming alcohol can help make recovery a reality. However, you increase your risk of permanent damage the more inflammation flares up.
3) Cirrhosis
Long-term inflammation can result in scar tissue replacing healthy liver tissue. This minimizes your liver’s ability to function at an optimal level.
When this occurs, the damage can become permanent and is usually irreversible. Cirrhosis can result in serious complications, such as liver failure.
Testing for Liver Damage Caused by Alcohol
Your doctor can test for liver damage in several ways, such as:
Blood Tests
Your doctor can test your liver’s function by doing a blood test. This type of test is beneficial in checking for enzymes and proteins that indicate the health of your liver.
For example, if you have high levels of ALT (alanine aminotransferase) and AST (aspartate aminotransferase) in your system, this indicates liver cell damage. High levels of bilirubin may point to your liver not processing waste efficiently.
However, it’s key to keep in mind that mild liver damage may sometimes not show up on blood tests, particularly in early-stage fatty liver.
Imaging Tests
With imaging, your doctor wants to see the size of your liver, its shape, and the level of fat or scar tissue accumulation in the liver.
Your doctor may also use an ultrasound to look at fat accumulation or scarring, or a CT scan or MRI to provide details regarding the structure of your liver. Furthermore, fibroScan (transient elastography) may also be used to measure liver stiffness, which can tell if your liver has scarring or cirrhosis. Here at Lam Clinic we are able to provide a FibroScan for patients which will give a steatosis score and fibrosis score, so the data of how bad your liver could be is very objective. It is also trackable over time to see if therapies that are implemented has actually made a difference on the liver.
Liver Biopsy
There might be instances where a doctor may recommend that you have a liver biopsy done. This involves having a small piece of liver tissue taken with a needle and an examination of the sample done under a microscope.
A liver biopsy is the most accurate way to examine the level of inflammation, fat accumulation, and scar tissue your liver is experiencing.
Is It Possible for Your Liver to Heal Itself?
It’s quite possible for the liver to heal itself, particularly if the damage is stopped early. The liver has a unique ability to repair itself even after it has been damaged by alcohol.
However, the extent of recovery is determined by the form and severity of the liver damage, plus how soon you put an end to drinking.
The liver is unique in its regenerative capacity. When you stop drinking alcohol, healing can begin within days to weeks. For instance, in cases of alcoholic fatty liver disease (the earliest stage of alcohol-related liver damage), the liver can return to normal within about two weeks of abstinence.
Even if you are in the advanced stages of liver damage, like mild alcoholic hepatitis, if you stop drinking alcohol, you can experience significant improvement over the long run.
However, not all liver damage is reversible. If alcohol consumption continues over many years, the liver may develop cirrhosis—a condition where scar tissue replaces healthy liver cells. Once cirrhosis sets in, the damage is generally irreversible, and stopping alcohol can only prevent further harm, not restore lost function.
Remedying Alcohol-Related Liver Disease
The most important step in addressing alcohol-related liver disease is stopping alcohol completely. Beyond that, care focuses on supporting liver health and preventing further damage:
Stop drinking alcohol completely – this is the most crucial step for healing.- Eat a healthy, balanced diet – include fruits, vegetables, lean proteins, and whole grains to give your liver the nutrients it needs.
- Exercise regularly – physical activity helps reduce liver fat and improves overall health.
- Maintain a healthy weight – excess weight can worsen liver damage.
- Avoid medications or substances that harm the liver – always check with your doctor before taking new medications or supplements.
- Supplements – Glutathione and milk thistle are great detoxifiers of the liver and help it work better in removing toxins. Depending on what stage you are at, they could be safe. Always check with your provider before starting supplements.
- NAD – could be useful for withdrawal symptoms as NAD is great at boosting mitochondrial pathways.
The Takeaway
Alcohol-associated liver damage is a common, yet preventable, condition. It is caused by heavy consumption of alcohol. If you consume more than the liver can break down, it can lead to serious liver damage. The best remedy is to stop drinking alcohol entirely and give your liver time to heal so it can return to normal.
Your gut health is central to liver health and your overall well-being. At Lam Clinic, we believe in Rooted Care that transforms lives and empowers futures, so you can thrive. Schedule your consultation today to begin your journey toward better liver health and renewed vitality.
