Fatty Liver and NASH: Contagious or Not?

Note: This article is based on my personal experience and research. I am not a doctor or a dietitian, and this content is for informational purposes only. Always consult with your healthcare provider before making any changes to your diet or lifestyle.

With some liver diseases being contagious – like hepatitis, for example – it’s only natural to wonder: if someone you know has fatty liver disease or NASH, can you get it too?

You can breathe easier: neither fatty liver disease (NALFD/MASLD) nor NASH are contagious. If somebody in your family has fatty liver or NASH, other members of the family won’t “catch” it. That’s because fatty liver isn’t caused by bacteria or viruses. And without an infectious agent, there’s nothing to transmit.

But this doesn’t mean that multiple people in the same family can’t have either NAFLD or NASH – but there are other factors in play, not the disease itself being transmissible from one person to another.

Let’s go deeper into why these types of liver disease are not contagious, what role family history might play, and the real things you should focus on if you or someone you love is dealing with a fatty liver.

Why People Think It Might Be Contagious

The confusion usually comes from association. Hepatitis affects the liver and is contagious, so people naturally assume that any liver disease could be. But fatty liver is a completely different story.

Instead of being triggered by a virus or bacteria, fatty liver happens when fat builds up inside liver cells. In NASH, the situation escalates further, with inflammation and potential scarring. But again – no virus, no bacteria, no infection to spread.

The confusion might also come from the full name of NASH – Non-alcoholic steatohepatitis” – people seeing “hepatitis” in the name, might worry it’s contagious. But it’s not.

If It’s Not Contagious, Why Do Some Families Share It?

This is where things get tricky and, at the moment, the answers are not generally agreed upon and are still somewhat in a grey area.

It is true: you might see multiple people in the same household diagnosed with fatty liver disease – but that’s not because the condition can be transmitted, but because of a mix of genetics and lifestyle habits.

First of all, we have shared habits, as families spend much time together and eat together. If the diet is high in processed foods, sugary drinks, and calorie-dense meals, multiple family members can end up getting a fatty liver. If you’re curious about its symptoms, read my article here.

Genetic predisposition is also considered a reason why multiple family members can get it. Research shows that some gene variants can increase the likelihood of developing fatty liver – and these genes can be passed from one generation to another.

However, this still doesn’t make fatty liver or NASH contagious – it just means some people are more vulnerable when exposed to the same conditions.

Finally, other health issues, including (but not limited to) diabetes, high cholesterol, and even certain medications, can increase risk. Families sometimes share these conditions too, making fatty liver more common in related groups.

So, yes, if someone in your family has fatty liver, other family members might be more prone to developing it, but not because the condition itself spreads, but because of the shared environment and even the shared DNA.

While the latter can’t be controlled, you CAN control what you eat and how active you are, so even if your family doesn’t have the healthiest of habits, you should. Who knows? Maybe you will even inspire them to do as you do and be healthier overall!

Common Worries, Answered

Since people diagnosed with fatty liver sometimes panic about what they can or can’t do around others, here are a few answers to questions you or your loved ones might have about this:

• Can I kiss someone with fatty liver? Yes, completely safe – you won’t pass it.
• Is it risky to share food, drinks, or utensils? No. There’s nothing to pass on if NAFLD or NASH are involved.
• What about sex? Zero risk of transmission.
• Could I get it from a blood transfusion? No, fatty liver isn’t in the blood either, and blood screening prevents other infections anyway.

Wrapping up

At least for this worry alone – whether it is contagious or not – you can relax if you have just been diagnosed with a fatty liver (or someone close to you has been), as it can’t be passed over.

You can reverse it, however, and my website helps you achieve that by sharing a lot of useful articles on how to do it, so make sure to browse it and gather all that important information.

If you’ve just been diagnosed, I recommend starting here to work on reversing fatty liver ASAP. Or, if you want things fully organized, you can buy my book, From Fatty Liver to Healthy Liver, and learn everything I did to heal my liver.

Remember that being supportive (if a closed one has been diagnosed) or finding support from friends, family or even strangers online can help a lot.

The lifestyle changes that are required to reverse fatty liver are pretty drastic at first, but with the support of loved ones or with external sources of motivation, it’s easier to do it. I recommend reading about the best diet for fatty liver and the inspirational story on how I reversed mine.