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Can long COVID affect the gut?

3-D illustration showing floating virus particles in red and white on the left and the center of a blue 3-D human male body in the middle with the gastrointestinal system highlighted in pinkish colors Low energy, brain fog, and lung problems are a few of the lingering aftereffects reported by some people who have had COVID-19. Could gut troubles also fall among the constellation of chronic symptoms that people with long-haul COVID experience? And if so, what do experts suggest to help ease this?

What happens to the gut during a COVID infection?

As we head into the fourth year since COVID-19 became a global health emergency, hundreds of millions of people around the globe have been infected with the virus that causes it. Since 2020, we’ve known that the virus particles that cause lung illness also infect the gastrointestinal (GI) tract: the esophagus, stomach, small intestines, and colon. This can trigger abdominal pain and diarrhea, which often — but not always — clear up as people recover.

We know chronic gut problems such as irritable bowel syndrome (IBS) sometimes occur even after illness caused by microorganisms like Campylobacter and Salmonella are cured. Could this happen with COVID-19?

What is long COVID?

While most people who get COVID-19 will survive, medical science is becoming aware of a group of people suffering from lasting declines in health. Well-reported long COVID aftereffects include tiredness, breathing difficulty, heart rhythm changes, and muscle pain. But few people, even in the medical field, are aware that long COVID symptoms may include chronic diarrhea and abdominal pain.

Why might the gut be involved in long COVID?

It is not clear why chronic gut symptoms might occur after a COVID-19 infection. One possible insight is a well-known syndrome called post-infectious irritable bowel syndrome (IBS) that may occur after a stomach flu (gastroenteritis).

Long after the bug causing the illness is gone, a change in gut-brain signaling may occur. A complex network of nerves connects the gut and the brain, and controls communication between different parts of the gut. These nerves tell body organs to produce digestive juices, alert you to the need to go to the bathroom, or prevent you from having another serving of stuffing at the Thanksgiving table.

The nerve network of the gut is so complicated that it is sometimes called the second brain. When the nerves are working well, you won’t notice a thing: you eat without pain, you move your bowels with ease, you have no GI worries. But what if the nerves are not working well? Then, even if the process of digestion remains normal, you may frequently have symptoms like pain or a distressing change in your bowel movements, such as diarrhea or constipation.

Once known as functional GI disorders, these health problems are now called disordered gut-brain interactions (DGBIs). When viruses and bacteria infect the gut, experts believe they may prompt a change in gut-brain signaling that can cause a DGBI like IBS to develop.

What to do if you’re noticing long-lasting gut problems after COVID-19 infection

We still do not know conclusively if COVID-19 can cause a long-term change in gut-brain messaging that leads to IBS or other disordered gut-brain interactions. But increasing evidence suggests that GI distress lasting six months or longer might be a symptom of long COVID. While we wait for more evidence, some GI specialists, including myself, recommend trying approaches that help relieve irritable bowel syndrome and other DGBIs.

If you are suffering from chronic abdominal pain and a change in your bowel movements after having had COVID-19, talk to your primary care doctor. Many health conditions have similar symptoms, including viral or bacterial infections, inflammation, or even cancers. A thorough exam can help to rule out certain conditions.

If the problem persists, do not suffer alone or feel embarrassed to act! Seek help if severe pain or changes in bowel movements are harming your quality of life or affecting daily activities. Talk with your doctor about the possibility that your chronic gut symptoms might be a form of long COVID. Find out if they can recommend helpful treatments or suggest a referral to a GI specialist. As research continues, new information may be available.

About the Author

photo of Christopher D. Vélez, MD

Christopher D. Vélez, MD, Contributor

Dr. Christopher Vélez is an attending gastroenterologist in the Center for Neurointestinal Health of Massachusetts General Hospital's division of gastroenterology and the MGH department of medicine. He focuses on neurogastroenterology and motility disorders of the esophagus, … See Full Bio View all posts by Christopher D. Vélez, MD

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Preventable liver disease is rising: What you eat — and avoid — counts

A word cloud on fatty liver disease; risk factors, such as alcohol and high fat diet, appear in different colorsIn today’s fast-paced world, our waking hours are filled with decisions — often surrounding what to eat. After a long day, dinner could well be fast food or takeout. While you may worry about the toll food choices take on your waistline or blood pressure, as a liver specialist, I also want to put fatty liver disease on your radar.

One variant, officially called nonalcoholic fatty liver disease (NAFLD), now affects one in four adults globally. Sometimes it progresses to extensive scarring known as cirrhosis, liver failure, and higher risk for liver cancer. The good news? Fatty liver disease can be prevented or reversed.

What is fatty liver disease?

Fatty liver disease is a condition caused by irritation to the liver. Liver tissue accumulates abnormal amounts of fat in response to that injury. Viral hepatitis, certain medicines (like tamoxifen or steroids, for example), or ingesting too much alcohol can all cause fatty liver disease.

However, NAFLD has a different trigger for fat deposits in the liver: a group of metabolic risk factors. NAFLD is most common in people who have high blood pressure, high cholesterol, insulin resistance (prediabetes), or type 2 diabetes. It is also common among people who are overweight or obese, though it is possible to develop NAFLD even if your body mass index (BMI) is normal.

What helps prevent or reverse NAFLD?

Diet can play a huge role. Because NAFLD is so closely tied to metabolic health, eating more healthfully can help prevent or possibly even reverse it. A good example of a healthful eating pattern is the Mediterranean diet.

Overweight or obesity is a common cause of NAFLD. A weight loss program that includes activity and healthy eating can help control blood pressure, cholesterol, and blood sugar. Among the many healthful diet plans that help are the DASH diet and the Mediterranean diet. Talk to your doctor or a nutritionist if you need help choosing a plan.

To vigorously study any diet as a treatment for fatty liver disease, researchers must control many factors. Currently, no strong evidence supports one particular diet over another. However, the research below highlights choices to promote a healthy liver.

Avoid fast food

A recent study in Clinical Gastroenterology and Hepatology linked regular fast-food consumption (20% or more of total daily calories) with fatty liver disease — especially in people who had type 2 diabetes or obesity. Fast foods tend to be high in saturated fats, added sugar, and other ingredients that affect metabolic health.

Steer clear of soft drinks and added sugars

Soft drinks with high-fructose corn syrup, or other sugar-sweetened beverages, lead directly to large increases in liver fat deposits, independent of the total calories consumed. Read labels closely for added sugars, including corn syrup, dextrose, honey, and agave.

Instead of sugary drinks, sip plain water. Black coffee or with a splash of cream is also a good pick; research suggests coffee has the potential to decrease liver scarring.

Avoid alcohol

Alcohol directly damages the liver, lacks nutritional value, and may affect a healthy microbiome. If you have NAFLD, it’s best to avoid any extra cause for liver injury. We simply do not know what amount of alcohol is safe for those with fatty liver disease — even social drinking may be too much.

Eat mostly whole foods

Vegetables, berries, eggs, poultry, grass-fed meats, nuts, and whole grains all qualify, but cutting out red meat may be wise. An 18-month trial enrolled 294 people with abdominal obesity and lipid imbalances such as high triglycerides. Regular activity was encouraged, and participants were randomly assigned to one of three diets: standard healthy dietary guidelines, a traditional Mediterranean diet, or a green-Mediterranean diet. (The green-Med diet nixed red and processed meats and added green tea and a dinner replacement shake rich in antioxidants called polyphenols.)

All three groups lost some weight, although the Mediterranean diet groups lost more weight and kept it off for a longer period. Both Mediterranean diet groups also showed reduced liver fat at the end of 18 months, but liver fat decreased twice as much in the green-Med group as in the traditional Mediterranean diet group.

Healthy fats are part of a healthy diet

We all need fat. Dietary fats help your body absorb vitamins and are vital in the protection of nerves and cells. Fats also help you feel satisfied and full, so you’re less likely to overeat. Low-fat foods often substitute sugars and starches, which affect blood sugar regulation in our bodies. But all fat is not created equal.

It’s clear that Mediterranean-style diets can help decrease liver fat, thus helping to prevent or possibly reverse NAFLD. These diets are high in healthful fats, such as monounsaturated fats found in olive oil and avocados and omega-3 fats found in walnuts and oily fish like salmon and sardines.

With so many choices, it’s hard to know where to start in the healthy eating journey. Let’s strive to eat whole foods in their natural state. Our livers will thank us for it.

About the Author

photo of Kathleen Viveiros, MD

Kathleen Viveiros, MD, Contributor

Dr. Kathleen Viveiros is a clinical hepatologist at Brigham and Women’s Hospital who sees patients in Boston and in Foxborough and Westwood, MA. She is an instructor in medicine at Harvard Medical School. Her professional interests … See Full Bio View all posts by Kathleen Viveiros, MD

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Is alcohol and weight loss surgery a risky combination?

Assorted alcoholic drinks (wine, beer, cocktail, brandy, and shot of liquor) lined up on dark wood bar; blurred alcohol bottles in background

For people with obesity, weight-loss surgery can reverse or greatly improve many serious health issues, such as diabetes, high blood pressure, and pain. But these procedures also change how the body metabolizes alcohol, leaving people more likely to develop an alcohol use disorder. A new study finds that one type of surgery, gastric bypass, may increase the dangers of drinking much more than other weight-loss strategies.

“Alcohol-related problems after weight-loss surgery are a known risk. That’s one reason we require people to abstain from alcohol for at least six months — and preferably a full year — before any weight-loss surgery,” says Dr. Chika Anekwe, an obesity medicine specialist at the Harvard-affiliated Massachusetts General Hospital Weight Center. The new findings are interesting and make sense from a biological perspective, given the differences in the surgeries, she adds.

How does weight loss surgery affect alcohol absorption?

Weight-loss surgeries dramatically reduce the size of the stomach.

  • For a sleeve gastrectomy, the most common procedure, the surgeon removes about 80% of the stomach, leaving a banana-shaped tube.
  • For a gastric bypass, a surgeon converts the upper stomach into an egg-sized pouch. This procedure is called a bypass because most of the stomach, the valve that separates the stomach from the small intestine (the pylorus), and the first part of the small intestine are bypassed.

The lining of the stomach contains alcohol dehydrogenase, an enzyme that breaks down alcohol. After weight-loss surgery, people have less of this enzyme available. So drinking wine, beer, or liquor will expose them to a higher dose of unmetabolized alcohol. Some alcohol is absorbed directly from the stomach, but most moves into the small intestine before being absorbed into the bloodstream.

After a sleeve gastrectomy, the pyloric valve continues to slow down the passage of alcohol from the downsized stomach to the small intestine. But with a gastric bypass, the surgeon reroutes the small intestine and attaches it to the small stomach pouch, bypassing the pyloric valve entirely. As a result, drinking alcohol after a gastric bypass can lead to extra-high blood alcohol levels. That makes people feel intoxicated more quickly and may put them at a higher risk of alcohol use disorders, says Dr. Anekwe.

Findings from the study on weight loss surgery and alcohol

The study included nearly 7,700 people (mostly men) from 127 Veterans Health Administration centers who were treated for obesity between 2008 and 2021. About half received a sleeve gastrectomy. Nearly a quarter underwent gastric bypass. Another 18% were referred to MOVE!, a program that encourages increased physical activity and healthy eating.

After adjusting for participants’ body mass index and alcohol use, researchers found that participants who had gastric bypass were 98% more likely to be hospitalized for alcohol-related reasons than those who had sleeve gastrectomy, and 70% more likely than those who did the MOVE! program. The rate of alcohol-related hospitalizations did not differ between people who had sleeve gastrectomy and those who did the MOVE! program.

The health harms of alcohol use disorder

Alcohol use disorder can lead to numerous health problems. Some require hospitalization, including alcoholic gastritis, alcohol-related hepatitis, alcohol-induced pancreatitis, and alcoholic cardiomyopathy. As the study authors note, people who had gastric bypass surgery had a higher risk of being hospitalized for an alcohol use disorder, even though they drank the least amount of alcohol compared with the other study participants. This suggests that change in alcohol metabolism resulting from the surgery likely explains the findings.

Advice on alcohol if you’ve had weight-loss surgery or are considering it

“We recommend that people avoid alcohol completely after any type of weight-loss surgery,” says Dr. Anekwe. A year after the surgery, an occasional drink is acceptable, she adds, noting that most patients she sees don’t have a problem with this restriction.

People who undergo weight-loss surgeries have to be careful about everything they consume to ensure they get adequate amounts of important nutrients. Like sugary drinks, alcohol is devoid of nutrients — yet another reason to steer clear of it.

Gastric bypass has become less popular than sleeve gastrectomy over the past decade, mostly because it’s more invasive and slightly riskier. While the new study suggests yet another downside of gastric bypass, Dr. Anekwe says it can still be a viable option for people with severe obesity, as bypass leads to more weight loss and better control of blood sugar than the sleeve procedure.

About the Author

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Julie Corliss, Executive Editor, Harvard Heart Letter

Julie Corliss is the executive editor of the Harvard Heart Letter. Before working at Harvard, she was a medical writer and editor at HealthNews, a consumer newsletter affiliated with The New England Journal of Medicine. She … See Full Bio View all posts by Julie Corliss

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Helping children who are neurodiverse build friendships

Three children with their bikes in a park with large green-leafed trees; the children, who are neurodiverse, are wearing helmets and grouped in a friendly way

Making friends and finding social opportunities can sometimes be difficult, particularly for children with neurodevelopmental disabilities, such as autism spectrum disorder, attention deficit hyperactivity disorder, or an intellectual disability. Here’s what parents can do to help.

Building inclusive communities

Friendships and social connections are an important aspect of our lives. They provide a sense of belonging and allow people to be included in their communities.

People with neurodevelopmental disabilities may communicate, learn, and behave differently. Sometimes these differences make it harder than usual to develop friendships and participate in social activities.

But parents and others can help create more inclusive communities and opportunities to build social relationships, especially for people with neurodiverse abilities.

Below are some tips and strategies to help children learn and develop the social and emotional skills they need to make friends.

Practice at home: Tips for common social situations

Navigating social settings and making friends involve many skills you can practice with children at home.

  • Greetings and questions. Make a habit of practicing greetings throughout the day. Model good listening for your child, and take turns asking and answering conversation starters like, “How are you?”
  • Calm body movements. Sometimes it can be hard for children with neurodevelopmental disabilities to keep a calm body. Have your child practice giving their body enough room and keeping personal space between themselves and others by using an arm’s-length distance.
  • Appropriate level of voice. Encourage your child to listen and match the level of your voice. Imagine your voice has a volume dial and practice turning the volume up and down.
  • Eye contact. Looking directly into someone’s eyes can be difficult, so help your child instead look at different parts of your face or practice looking at their own eyes in the mirror.
  • Reading and responding to social signals. People regularly communicate using more than just words. Social signals are the variety of ways in which we communicate through body language and facial expressions. Often this can be tricky to detect for children who are neurodiverse. Help your child recognize common social signals by asking what someone’s body or face might be saying.

Rerouting challenging behaviors to help children build friendships

Challenging behaviors may get in the way of making and keeping friends. It is important to address challenging behaviors like impulsivity and aggression through therapies and programming. Additionally, practicing the following fundamental skills can help reduce challenging behaviors.

  • Patience. Learning how to wait for a turn to play or a time to speak in a conversation is an important social skill. Practice waiting with a timer, gradually building up from 10 seconds, to one minute, to five minutes.
  • Flexibility. Help your child make compromises using first/then statements, such as, “First we play your way, then my way.” Model flexible play and redirect with new toys to show how play can evolve.
  • Communicating strong emotions.Handling strong feelings can be difficult sometimes. Practice communicating these feelings effectively either by asking for help, using an emotions board, or taking a break.

How to throw a wide net socially

Encouraging social opportunities is an important part of supporting friendships and social relationships for children with neurodevelopmental disabilities. Social spaces offer chances for children who are neurodiverse to find activities they enjoy. They are able to practice the social and emotional skills they are learning and even meet other children practicing these same skills.

  • Structure and organize play dates. Set up the environment before a play date by making a list of activities to do with a friend, then picking out of a hat which activities to do and in what order.
  • Make a list of things that are fun to do and invite others to join. Look for free or low-cost programs or events out in the community.
  • Connect with other parents of children with disabilities. Set up an activity for your children like an ice cream date, going on a walk, or a game night with adults and kids together. These encounters can give rise to repeat, planned social interactions.
  • Check out organizations in the community for children with disabilities, like Special Olympics, or recreational programs that foster inclusive environments through Unified Sports.
  • Look into facilitated recreational activities like a Lego club or pizza parties with teachers. Plan to bring a support person if needed.

Your child’s doctor or teacher may be able to suggest additional community or web-based resources designed to help families support friendships for children with neurodiverse abilities.

About the Authors

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Sydney Reynders, ScB, Contributor

Sydney Reynders, ScB, is a clinical research coordinator in the Boston Children’s Hospital Down Syndrome Program. She assists in research investigating educational, behavioral, and medical interventions in Down syndrome and other neurodevelopmental disorders. She received her … See Full Bio View all posts by Sydney Reynders, ScB photo of Nicole Baumer, MD, MEd

Nicole Baumer, MD, MEd, Contributor

Nicole Baumer, MD, MEd is a child neurologist/neurodevelopmental disabilities specialist at Boston Children's Hospital, and an instructor in neurology at Harvard Medical School. Dr. Baumer is director of the Boston Children's Hospital Down Syndrome Program. She … See Full Bio View all posts by Nicole Baumer, MD, MEd