Month: November 2022

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

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

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

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

Hot flashes and sleep or mood changes are well-known, troublesome symptoms that may occur during perimenopause and menopause. Now, one survey suggests nearly 80% of midlife women use cannabis to ease certain symptoms, such as mood issues and trouble sleeping.

Mounting numbers of US states have legalized marijuana for medical or recreational use in recent years. This wave of acceptance runs alongside skepticism in some quarters concerning FDA-approved menopause treatment options, including hormone therapy. But a lack of long-term research data surrounding cannabis use has led one Harvard expert to question how safe it may be, even while acknowledging its likely effectiveness for certain menopause woes.

“More and more patients tell me every year that they’ve tried cannabis or CBD (cannabidiol, an active ingredient in cannabis), particularly for sleep or anxiety,” says Dr. Heather Hirsch, head of the Menopause and Midlife Clinic at Harvard-affiliated Brigham and Women’s Hospital. “Adding to its appeal is that cannabis is now legal in so many places and works acutely for a couple of hours. You don’t need a doctor’s prescription. Socially, it may be easier to justify than using a medication. But why is there a movement toward saying okay to something that has unknown long-term effects, more than something that’s been studied and proven safe?” she asks.

Survey reports on who uses cannabis, why, and how

The new Harvard-led survey, published in the journal Menopause, looked at patterns of cannabis use in 131 women in perimenopause — the often years-long stretch before periods cease — along with 127 women who had passed through menopause. Participants were recruited through online postings on social media sites and an online recruitment platform. Nearly all survey respondents were white and most were middle-class, according to income reporting.

The vast majority (86%) were current cannabis users. Participants were split on whether they used cannabis for medical reasons, recreational purposes, or both. Nearly 79% endorsed it to alleviate menopause-related symptoms. Of those, 67% said cannabis helps with sleep disturbance, while 46% reported it helps improve mood and anxiety.

Perimenopausal women reported worse menopausal symptoms than their postmenopausal peers, as well as greater cannabis use to address their symptoms. More than 84% of participants reported smoking cannabis, while 78% consumed marijuana edibles, and nearly 53% used vaping oils.

One glaring limitation of the analysis is its self-selected group of participants, which lacked diversity and might skew results. But Dr. Hirsch wasn’t surprised by the high proportion reporting regular cannabis use. “I wouldn’t be surprised if those numbers reflect the broader population,” she says.

How might cannabis help menopause symptoms?

It makes sense that midlife women reported cannabis improves anxiety, mood, and sleep, Dr. Hirsch says. The drug likely helps all of these symptoms by “dimming the prefrontal cortex, the decision-making part of our brain.”

For many women, anxiety spikes during perimenopause, she notes. Common stressors during that time, such as aging parents or an emptying nest, add to the effects of dipping hormones. “It’s that feeling of, ‘I can’t turn my brain off.’ It’s really disturbing because they get in bed and can’t fall asleep, so they’re more tired, moody, and cranky the next day,” she explains. Dimming the prefrontal cortex enables people to calm down.

Hot flashes, often cited as the most common menopause symptom, did not improve as much from cannabis use, according to survey respondents. That too makes sense, Dr. Hirsch says, because the hypothalamus — the brain region considered the body’s thermostat — isn’t believed to be significantly affected by the drug.

No research yet on long-term effects

Given a lack of clinical trials objectively testing the effectiveness and safety of cannabis to manage menopause symptoms, more research is clearly needed.

“If people are finding relief from cannabis, great. But is it safe? We think so, but we don’t know,” she says. “There are no studies of middle-aged women using cannabis for 10 years, for as long as menopause symptoms often last. Are there going to be long-term effects on memory? On lung function? We don’t know.”

About the Author

Maureen Salamon, Executive Editor, Harvard Women's Health Watch

Maureen Salamon is executive editor of Harvard Women’s Health Watch. She began her career as a newspaper reporter and later covered health and medicine for a wide variety of websites, magazines, and hospitals. Her work has … See Full Bio View all posts by Maureen Salamon