Eating oats for just a short period of time could have a profound impact on cholesterol levels, according to a recent study.

Researchers from the University of Bonn in Germany conducted a trial in which adults consumed a calorie-reduced diet of almost exclusively oatmeal for two days.

All participants suffered from a metabolic syndrome associated with a risk of diabetes, including a combination of high body weight, high blood pressure, elevated blood glucose or elevated blood lipid levels, according to a university press release.

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The 32 participants ate oatmeal, previously boiled in water, three times a day, for a total of 300 grams. They were only permitted to add fruits or vegetables to their meals and consumed around half of their normal caloric intake.

A control group was put on a calorie-reduced diet that did not include oats. Although both groups benefited, the cholesterol levels of those on the oat diet “improved significantly.” After six weeks, this effect “remained stable.”

Study author Marie-Christine Simon, junior professor at the Institute of Nutritional and Food Science at the University of Bonn, shared in a statement that the level of LDL, or “bad” cholesterol, among the oatmeal-eating group was reduced by 10%.

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“That is a substantial reduction, although not entirely comparable to the effect of modern medications,” Simon said. “They also lost two kilos in weight on average, and their blood pressure fell slightly.”

The authors concluded that the diet influenced microorganisms in the gut, leading to the positive reaction. The results were published in the journal Nature Communications.

Simon concluded that a short-term oat-based diet at regular intervals “could be a well-tolerated way to keep the cholesterol level within the normal range and prevent diabetes.”

“As a next step, it can now be clarified whether an intensive oat-based diet repeated every six weeks actually has a permanently preventative effect,” she said.

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Certified holistic nutritionist Robin DeCicco, who was not involved in the study, said the findings “make sense” because oats have been known to potentially lower LDL cholesterol.

Oats contain prebiotic fiber that feeds beneficial gut bacteria. When those bacteria ferment the fiber, they produce compounds that support digestive health, according to the expert.

“The more beneficial gut bacteria you have in your stomach, in your environment, the more that can reduce or inhibit the production of LDL bad cholesterol,” New York-based DeCicco told Fox News Digital.

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Oats are also a whole grain that is naturally low in saturated fat and rich in fiber and provides a good amount of plant-based protein.

“All those things are good for a heart-healthy, cholesterol-lowering diet,” DeCicco noted.

DeCicco did warn that those who are diabetic or prediabetic should “be careful” when eating oats.

“While oats can lower cholesterol, they are an overly high-carbohydrate food,” she said. “A recommendation for anyone who’s watching their blood sugar, and especially who’s diabetic, is to eat foods that are lower in starch and higher in protein and fiber, [and to get] their carbohydrates more from vegetables and nuts.”

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Megan Wroe, registered dietitian at the Wellness Center at Providence St. Jude Medical Center in Orange County, California, agreed that oat consumption “does seem to lower cholesterol levels for all studied populations, with the greatest impact shown in those with elevated levels.”

“There are no significant risks, but some people may experience cramping or indigestion if they have not previously eaten much fiber and suddenly start eating oats every day,” Wroe, who also was not involved in the study, told Fox News Digital. “Also, those requiring a gluten-free diet will want to ensure that the oats they eat are certified gluten-free.”

The nutritionist also shared the concern that oatmeal is commonly made with water or milk and eaten with added sugar and fruit, which makes it a “potentially very high-glycemic meal.”

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“Knowing this, my recommendation is to eat oats as often as you like, choosing steel-cut or rolled oats, using fruit for sweetness or a low-glycemic sweetener if needed, such as monk fruit,” she advised.

Wroe also suggests finding a way to add protein to balance out the carbohydrates. 

“This can be done by adding chia or flax seeds to the oats, mixing in protein powder or topping with Greek yogurt to serve,” she said.

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A bacterium prevalent in sinus infections and pneumonia may aggravate Alzheimer’s disease, according to a recent study published in Nature Communications. 

The bacterium, Chlamydia pneumoniae, was found in the eyes of deceased patients with Alzheimer’s disease, according to researchers from Cedars-Sinai’s Health Sciences University in California.

“The retina is directly connected with the brain. It’s a developmental extension of the brain,” lead researcher Maya Koronyo-Hamaoui, PhD, professor of neurosurgery, neurology and biomedical sciences at Cedars-Sinai Health Sciences University, told Fox News Digital.

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Eye-brain link

The study showed that Chlamydia pneumoniae could reach the retinal tissue that lines the back of the eye and linger for several years, creating an inflammatory response potentially linked to the death of nerve cells. This could contribute to cognitive decline and could worsen Alzheimer’s disease symptoms. 

The findings point to potential therapies for Alzheimer’s disease that would target inflammation and provide antibiotic treatment in the early stages of infection, according to Koronyo-Hamaoui.

“One hope of this study is that when people do present with some [symptoms of] pneumonia or atypical pneumonia or some respiratory infection, doctors should consider testing specifically for Chlamydia pneumoniae, and then give them the specific antibiotic,” the researcher said.

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The infection can be identified through laboratory testing, including PCR (polymerase chain reaction), blood tests, or cultures that allow live organisms to grow for analysis.

Inside the study

The researchers examined retinal tissue samples from over 100 deceased individuals who fell into three groups: those who had Alzheimer’s disease, those who had some cognitive deficit or those who did not have the disease. 

They analyzed proteins, conducted genetic testing and used advanced imaging techniques on the samples. Those with Alzheimer’s disease had higher levels of the bacterium in their brains and retinal tissue compared to those who had normal cognition, the release stated.

Genetic risk

Higher levels of chlamydia pneumonia were found in those who carried the gene variant APOE4, which is an associated risk factor for Alzheimer’s disease, Koronyo-Hamaoui added. The bacterium was also associated with more severe cognition decline.  

The Cedars-Sinai team also looked at human neurons and lab mice with Alzheimer’s disease, finding that Chlamydia pneumoniae was linked to increased inflammation, nerve cell death and cognitive decline, further suggesting that it may play a role in accelerating the disease. 

The infection also prompted production of amyloid-beta, which is a protein known to accumulate in the brains of those with Alzheimer’s, Koronyo-Hamaoui said.

While the study points toward using the retina as a way to diagnose and monitor the disease, the researcher acknowledged that more research is needed to confirm these findings.

Experts urge caution

Dr. Aaron Glatt, chief of infectious diseases at Mount Sinai South Nassau on Long Island, New York, was not involved with the study but called the findings “interesting.” 

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Glatt, who is also a spokesperson for the Infectious Diseases Society of America, emphasized that the findings only show an association and not causation, and that much more clinical research is needed.

“It does not mean infections cause Alzheimer’s or that people should worry about past respiratory illnesses.”

“Chlamydia pneumoniae is a very common respiratory pathogen that many people are exposed to throughout their lives,” he told Fox News Digital. “While the study identifies a link between this bacterium and neurodegeneration, a standard sinus infection does not mean a patient will develop Alzheimer’s.”

The key takeaway, according to Glatt, is that the study opens new doors for potential diagnostics and treatments, but is “not a reason for immediate alarm regarding common infections.”

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Dr. Sharon Fekrat, MD, a clinical spokesperson for the American Academy of Ophthalmology and a retina specialist at the Duke University School of Medicine in North Carolina, agreed that the findings could help researchers better understand how inflammation may drive disease progression and “could lead to new ways to detect or treat Alzheimer’s in the future.”

“This is early research suggesting that infection-related inflammation may worsen Alzheimer’s disease in people who are already vulnerable,” Fekrat, who also did not work on the study, told Fox News Digital. “It does not mean infections cause Alzheimer’s or that people should worry about past respiratory illnesses.”

What’s next

While some teams are developing and testing retinal imaging tools in living patients, those methods are not yet part of routine clinical screenings or diagnosis, Fekrat noted.

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For now, the best proven steps include following brain-healthy habits, such as managing cardiovascular risk factors, staying mentally and socially engaged, and seeking medical care for any cognitive symptoms, the expert added.