The Link Between Gut Health and Brain Function
The connection between our gut and brain has fascinated me for a long time, and recent research supports the idea that nutrition can significantly impact health outcomes.
Dr. Trisha Pasricha, a renowned internal medicine physician and gastroenterologist, leads the Gut-Brain Institute and teaches at Harvard Medical School. Many might recognize her from her “Ask a Doctor” column in The Washington Post.
In a recent episode of “Healthful,” Pasricha suggested shifting our perspective: instead of viewing the gut merely as plumbing, think of it as a kind of brain.
We discussed everything from how to handle a cyclospora infection to how reducing ultra-processed food intake might help stave off dementia. Here are some insights from our conversation — you can check it out on YouTube or listen on your favorite podcast platform:
Early Signs of Parkinson’s Disease
Researchers are uncovering early indicators of Parkinson’s disease, which might manifest decades before motor symptoms show up. Pasricha explained the “first-gut theory,” which posits that some Parkinson’s cases may actually originate in the gut rather than the brain.
A key factor in Parkinson’s is a misfolded protein that harms dopamine-producing neurons, leading to the characteristic tremors. Research indicates this protein could begin misfolding in the gut before moving to the brain.
Pasricha noted that many of her Parkinson’s patients experience severe gastrointestinal symptoms like constipation and nausea, often starting years before tremors. She hopes advancements in the next 10 to 15 years will allow for diagnosing early-stage Parkinson’s based on gut symptoms.
Another possible early symptom to watch for is REM sleep disorder, characterized by intensely vivid dreams that might cause physical movements during sleep.
GLP-1s and Gut Protection
This seems a bit surprising, but you’ve probably heard about the side effects associated with GLP-1 medications, such as constipation and nausea. Pasricha’s research indicates that, despite those issues, GLP-1 users show a lower chance of developing ulcers and colorectal cancer, along with a lower risk for several other types of cancer.
Researchers think GLP-1s might help reduce inflammation in the gut and body, which could explain the decreased cancer risks.
Fiber Intake in America
I was quite taken aback by this statistic.
Fiber contributes to heart and brain health while lowering inflammation, yet 95% of Americans aren’t hitting their daily fiber targets.
According to Pasricha, women under 50 should aim for 25 grams of fiber daily, while those over 50 should consume 21 grams. Men are advised to target 38 grams if they’re under 50, and 30 grams once they reach 50.
She suggests a straightforward approach: instead of removing foods from your plate, simply add a high-fiber option. For instance, she often gives her kids berries, nuts, and Greek yogurt popsicles for breakfast. And if you’re on the go, a fiber supplement can help maintain your intake.
