HEALTH NEWS
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Study reveals how different plant saponins alleviate ischemic stroke
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The bacteria on your tongue could be linked to your brainpower
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Staying Active Could Have Two Major Benefits for People With Parkinson’s, Scientists Find
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How spinach protects the brain while tap water may pose a hidden risk
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Frequent and unintentional daytime napping linked to higher dementia risk in older adults
Study reveals how different plant saponins alleviate ischemic stroke
Zheijiang University (China), October 12 2026 (News-Medical)
Ischemic stroke accounts for approximately 85% of all strokes and remains a major cause of death and long-term disability. Current treatments can restore blood flow in eligible patients, but therapeutic options remain limited, particularly for protecting threatened brain tissue and supporting recovery. Two types of ginseng -- Panax notoginseng and Panax ginseng have long been used in traditional Chinese medicine and are commonly associated with "activating blood" and "replenishing qi," respectively. Modern studies have reported anti-inflammatory, antioxidant, and anti-apoptotic effects for their saponins.
A study published in Targetome reports that the two saponin preparations alleviate ischemic brain injury through shared neuroprotective effects but preferentially regulate vascular-cytoskeletal and mitochondrial-metabolic pathways, respectively.
The researchers established permanent middle cerebral artery occlusion in male C57BL/6 mice and administered low or high doses of P. notoginseng saponins (PNS) or P. ginseng saponins (PGS), with edaravone serving as a positive control. Twenty-four hours later, they assessed neurological deficits, infarct volume, tissue damage, neuronal integrity, and apoptosis; a separate experiment monitored survival for seven days. At 200 mg·kg, PNS and PGS lowered neurological scores from 3.67 in untreated model mice to 2.00 and 2.17, respectively. PNS reduced average infarct volume from 30.73% to 11.70%, comparable to the drug edaravone, while PGS reduced it to 13.33%. Seven-day survival increased from 25% in model mice to 75% with PNS and 50% with PGS.
The bacteria on your tongue could be linked to your brainpower
University of Exeter (UK), October 12 2026 (Medical Xpress)
Whether you're a quick or slow thinker depends on several factors, such as the efficiency of the brain's wiring and the amount of gray matter in specific control centers. But there may be another, rather surprising influence, and that's the bacteria in your mouth. Scientists have found an association between the mix of microbes on your tongue and how well the brain performs cognitive tasks as we age.
Previous studies have shown that poor oral health and gum disease are linked to cognitive impairment. Other research has found that nitrate from the food we eat can influence blood flow to the brain and cognitive performance.
The research team recruited 15 younger adults and 15 older adults.
Each volunteer completed a set of 10 tests that assessed memory, processing speed and focus. The researchers collected tongue swabs and blood and saliva samples. They then sequenced the DNA in the swabs to identify which bacteria were present.
People with higher levels of Prevotella histicola in their mouth showed faster reaction times on different cognitive tasks. But the results for another microbe, Haemophilus parainfluenzae, were mixed. Older adults had higher levels of bacteria tied to gum disease, such as Treponema and Tannerella.
Staying Active Could Have Two Major Benefits for People With Parkinson’s, Scientists Find
University of Cincinnati, October 13 2026 (SciTech Daily)
People with Parkinson’s disease who stay more physically active may experience slower declines in memory, thinking, and movement abilities, according to a study that followed participants for up to seven years. Researchers found that greater activity was consistently associated with more favorable outcomes.
The study included 294 adults with mild to moderate Parkinson’s disease, whose average age was 66. Participants reported how much time they spent being physically active each week, including activities at work, around the house, and during recreation. Participants were classified into three groups: those active for up to four hours weekly, those active for four to eight hours, and those exceeding eight hours.
On a 30-point cognitive assessment, where lower scores indicate poorer performance, the least active participants experienced an estimated average decline of 0.478 points per year. The middle group declined by 0.090 points annually, while the most active group showed almost no average decline, at just 0.007 points per year.
How spinach protects the brain while tap water may pose a hidden risk
Edith Cowan University (Australia), October 11 2026 (Natural News)
In a finding that underscores a critical nuance in nutritional science, a landmark 27-year study has revealed that not all nitrates are created equal. Researchers tracking over 54,000 adults discovered that the chemical compound nitrate, found in both spinach and tap water, has starkly opposite associations with dementia risk depending on its source. The research, published in the journal Alzheimer's & Dementia, suggests that while nitrate from vegetables is linked to a lower likelihood of dementia, nitrate from processed meats and drinking water—even at levels deemed safe by regulators—is associated with a higher risk.
- A 27-year study found that nitrate from vegetables is linked to a lower risk of dementia, while nitrate from processed meats and tap water is associated with a higher risk.
- Vegetables deliver nitrate with antioxidants that promote its conversion to beneficial nitric oxide. Processed meats contain compounds that can steer nitrate toward forming harmful molecules linked to brain cell damage.
- Increased dementia risk was associated with nitrate levels in drinking water far below current U.S. safety limits, suggesting regulations set for acute infant poisoning may not protect against long-term brain health risks.
- Consuming about 64 mg of nitrate daily from vegetables—equivalent to roughly half to one-and-a-half cups of raw leafy greens—was linked to the lowest dementia rates.
Vegetables deliver nitrate packaged with protective antioxidants like vitamin C and polyphenols. These compounds help steer nitrate toward forming beneficial nitric oxide while blocking its conversion into harmful molecules called N-nitrosamines, which animal studies have linked to brain cell damage.
Meat, however, presents a riskier biochemical package. It contains elements like heme iron and specific proteins that can promote the formation of those damaging N-nitrosamines. This creates a scenario where the same initial compound—nitrate—can lead to vastly different outcomes in the brain.
Researchers found elevated dementia rates associated with nitrate concentrations between 1.8 and 5.1 milligrams per liter. These levels are roughly one-tenth of the current U.S. Environmental Protection Agency safety limit of 44 mg/L, a standard set decades ago primarily to prevent acute infant illness, not long-term brain health in adults.The primary source of water nitrate is agricultural fertilizer runoff.
Frequent and unintentional daytime napping linked to higher dementia risk in older adults
Johns Hopkins School of Public Health, October 13 2026 (Euerkalert)
Daytime napping is common among older adults. New research from the Johns Hopkins Bloomberg School of Public Health suggests that how often, how intentionally, and how long older people nap may be linked to their risk of developing dementia.
The study, published in The Journal of Gerontology: Medical Sciences, followed 995 U.S. Medicare beneficiaries age 65 and older who were free of dementia at the start of the study in 2013 and tracked them for up to 10 years.
The researchers found that participants who napped frequently—defined as most days or every day—had a 48% higher risk of developing dementia compared to those who rarely or never napped, even after accounting for demographic factors, health conditions, and nighttime sleep characteristics such as sleep duration, daytime sleepiness, and a measure of obstructive sleep apnea risk.
Unintentional napping—defined as falling asleep without meaning to rather than planning a nap—was associated with a 39% higher risk of dementia. Napping for 30 minutes or less was also linked to a 40% higher risk.
