A handful of walnuts a day may keep the doctors away, according to a clinical trial at UConn School of Medicine.
Well, certain types of important doctors that is.
The clinical trial confirmed the health benefits of eating walnuts in improving colonic health and for cancer prevention, a spokesperson for UConn School of Medicine said.
“Ellagitannins in the walnut are importantly providing the anti-inflammatory and anti-cancer properties that we’re seeing in patients in our clinical trial research, particularly the gut’s conversion of ellagitannins to a potent anti-inflammatory agent, urolithin A,” said Daniel W. Rosenberg, who leads a multidisciplinary team of researchers at the UConn School of Medicine.
To put in everyday language, Rosenberg said, “There are many potential benefits one can get from eating walnuts, with so little downside risk, that just grabbing a handful every day is really something that you can easily do for your long-term health benefit.”
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Rosenberg has also researched the connection between walnut consumption and its anti-inflammatory properties.
The UConn research team’s clinical trial findings show that high levels of urolithin A formation by the gut microbiome from walnut consumption has a positive impact on reducing inflammatory markers across blood, urine, and fecal samples, and may even positively affect the immune cells within colon polyps, according to UConn.
For the clinical trial, patients between the ages of 40 to 65 years and at an elevated risk for colon cancer, were referred for the study from the Division of Gastroenterology at UConn Health, the University of Connecticut’s academic medical center, according to UConn.
Each of 39 enrolled study participants were screened by the clinical research team at UConn John Dempsey Hospital and asked to complete an NIH Food Frequency Questionnaire for analysis by Ock Chun Ph.D., a nutritional epidemiologist in the College of Agriculture, Health and Natural Resources at UConn Storrs.
Patients were asked to avoid all ellagitannin-containing foods and beverages for a week to set their urolithin levels at or close to zero before they began consuming ellagitannin-rich walnuts as part of their closely monitored diet, according to a statement from UConn.
At the end of the three-week study, all participants received a high-definition colonoscopy done by Drs. John Birk and Haleh Vaziri.
Among the key findings the researchers found that elevated urolithin A levels in the urine of patients correlated with the serum levels of peptide YY, a protein that has been associated with inhibition of colorectal cancer. Reduced levels of several inflammation markers present in the blood were also found, especially in obese patients that had the greatest capacity to form urolithins by their gut microbiome, according to a statement from UConn.
Rosenberg also used high-dimensional spatial imaging technology that allowed UConn researchers to develop a detailed view of cellular interactions present inside colon polyps that were removed during colonoscopy at the end of the walnut study.
The imaging technology revealed that patients with high levels of urolithin A formation following walnut consumption was associated with reduced levels of several important proteins that are often present in polyps, showing for the first time how walnut ingestion may enhance colon health.
The research team also found that the protein vimentin, often associated with more advanced forms of colon cancer, was greatly reduced inside polyp tissues obtained from patients who had also formed the highest levels of urolithin A by their gut microbiome.
The new findings build upon the earlier work of Dr. Masako Nakanishi, an assistant professor in the Rosenberg Lab, who showed in several earlier publications that walnuts had beneficial and anti-cancer effects in the colons of cancer-prone mice, key findings that prompted the current clinical trial.
“Urolithin A has a very positive influence on inflammation and maybe even cancer prevention,” Rosenberg said. “Our study proves that dietary supplementation with walnuts can boost the general population’s urolithin levels in those people with the right microbiome, while significantly reducing several inflammatory markers, especially in obese patients.”
Rosenberg said the study provides strong rationale for dietary inclusion of walnut ellagitannins for cancer prevention.The research was supported by awards from the American Institute for Cancer Research, the California Walnut Commission, and the National Cancer Institute.
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