Medical Bulletin 02/March/2026 - Video

Here are the top medical news for today:

Middle-Aged Men Most Susceptible to Aging Effects of Emerging PFAS: Study

Everyday products—from non-stick pans to food wrappers—may be quietly speeding up our biological clock. A new study suggests that certain “forever chemicals” in our blood are linked to faster biological aging, especially in middle-aged men.

Per- and polyfluoroalkyl substances (PFAS) are a large group of synthetic chemicals widely used for their resistance to heat, water, and stains. Because they contain extremely strong chemical bonds, they do not easily break down in the environment or the body. Over time, PFAS have been detected in water, soil, wildlife, and human tissues, raising concerns about links to cancer, infertility, obesity, and hormone disruption.

In the new study, published in Frontiers in Aging, researchers analyzed data from 326 older adults who participated in the US National Health and Nutrition Examination Survey (1999–2000). Blood samples were tested for 11 PFAS compounds, and DNA methylation patterns—chemical markers that regulate gene activity—were examined. These data were then processed using 12 established “epigenetic clocks,” algorithms that estimate biological age based on DNA changes.

The team found that two compounds—per-fluoro-nonanoic acid (PFNA) and per-fluoro-octane-sulfonamide (PFOSA)—were present in 95% of participants. Higher levels of these chemicals strongly predicted faster epigenetic aging in men aged 50 to 64, but not in women. Other commonly detected PFAS, including PFOS and PFOA, showed no clear link to biological age in this analysis.

Researchers suggest that midlife may be a particularly vulnerable window, when the body becomes more sensitive to stressors. Lifestyle factors such as smoking could further amplify the impact in men. The findings highlight that newer or less-regulated PFAS may also carry risks, underscoring the need for broader chemical safety regulations and greater awareness of cumulative environmental exposures.

REFERENCE: Xu, Y.-Q., et al. (2026). Emerging PFAS contaminants PFNA and PFSA amplify epigenetic aging: sex- and age-stratified risks in an aging population. Frontiers in Aging. DOI: 10.3389/fragi.2025.1722675. https://www.frontiersin.org/journals/aging/articles/10.3389/fragi.2025.1722675/full

Higher Fiber Intake Linked to Lower Heart Disease Risk in Night Shift Workers: Study

Night shift work has long been linked to a higher risk of coronary heart disease (CHD), and new research suggests diet—particularly fiber intake—may influence that risk. A large study published in the European Journal of Epidemiology explored whether dietary fiber and meat avoidance help explain differences in CHD risk between daytime and shift workers.

The study followed 222,801 adults with an average age of 53 years over a median period of 12.6 years. Participants were grouped into daytime workers (83.6%), shift workers with few or no night shifts (13%), and regular night shift workers (3.3%).

After adjusting for socioeconomic and lifestyle factors, night shift workers had a 10% higher risk of developing CHD compared to daytime workers. Occasional shift workers did not show a significantly elevated risk after full adjustments.

Fiber intake emerged as an important modifying factor. Lower daily fiber consumption was associated with higher CHD risk among shift workers compared to daytime workers. However, as fiber intake increased, the excess risk weakened significantly.

Statistical modeling suggested that night shift workers would need around 19 grams of fiber per day to reduce their CHD risk to levels comparable to daytime workers, while occasional shift workers required about 15 grams per day. Researchers caution that this reflects statistical interaction rather than proof that high fiber completely neutralizes shift-related risk.

Meat avoidance—defined as consuming no processed or unprocessed red meat—was linked to a 10.4% lower CHD risk overall. However, unlike fiber, this association did not differ by work schedule.

Although observational, the findings suggest that higher fiber intake may help mitigate cardiovascular stress associated with night shift work. Tailored nutritional strategies could complement broader heart health recommendations for shift workers.

REFERENCE: Noga, D. A., Meth, E. M. S., Pacheco, A. P., et al. (2026). Night shift work, dietary patterns, and coronary heart disease. Cardiovascular Disease. DOI: https://doi.org/10.1007/s10654-026-01362-w.https://link.springer.com/article/10.1007/s10654-026-01362-w

Alzheimer’s Disease May Begin with Subtle Decline in Brain Blood Flow

Subtle changes in how blood flows through the brain and how oxygen is delivered to brain cells may be closely tied to the risk of Alzheimer’s disease, according to new research from the Mark and Mary Stevens Neuroimaging and Informatics Institute at the Keck School of Medicine of USC.

The study, published in Alzheimer's & Dementia, examined older adults with and without cognitive impairment and found that simple, noninvasive measures of brain circulation were linked to key markers of Alzheimer’s, including amyloid plaque buildup and shrinkage of the hippocampus, a region critical for memory.

Researchers used amyloid PET imaging to measure plaque accumulation in the brain, where warmer colors indicate higher amyloid levels. Participants whose brain blood flow and oxygen regulation patterns more closely resembled those seen in healthy aging tended to have lower amyloid burden and larger hippocampal volumes.

These features are associated with reduced Alzheimer’s risk, reinforcing the idea that vascular health may influence early disease-related changes.

To assess cerebrovascular function, the team used transcranial Doppler ultrasound to track blood flow speed in major brain arteries and near-infrared spectroscopy to evaluate oxygen delivery to cortical tissue.

Advanced mathematical modeling combined these readings into overall indicators reflecting how well the brain adjusts blood flow and oxygen in response to natural fluctuations in blood pressure and carbon dioxide.

Individuals with mild cognitive impairment or dementia showed weaker vascular function compared to cognitively normal participants.

Although the findings do not prove cause and effect, they suggest that monitoring brain vascular health could support earlier, more accessible screening and potentially guide prevention strategies in Alzheimer’s disease.

REFERENCE: Amaryllis A. Tsiknia, Jamie A. Terner, Zoe E. Tsokolas, Dae C. Shin, Elizabeth B. Joe, Peter S. Conti, Rebecca J. Lepping, Brendan J. Kelley, Rong Zhang, Sandra A. Billinger, Helena C. Chui, Vasilis Z. Marmarelis, Meredith N. Braskie. Cerebrovascular regulation dynamics and Alzheimer-'s neuroimaging phenotypes. Alzheimer-'s, 2026; 22 (2) DOI: 10.1002/alz.71146