Medical Bulletin 10/June/2026 - Video

Here are the top medical news for today:

Study Highlights Heart Benefits of Flavanol-Rich Fruits in Daily Diet

Your heart may benefit more from which fruits and vegetables you eat than simply how many servings you consume, according to a major new international study.

Researchers from the University of Reading, Harvard Medical School, the University of California Davis, and Mars, Inc. analyzed dietary data and biomarker measurements from more than 30,000 people in the United Kingdom and United States.

Their findings, published in Food and Function, revealed that fewer than 20% of participants consumed enough flavanols—natural plant compounds linked to cardiovascular protection—to reach levels previously associated with a lower risk of heart disease.

Earlier research, including the large COSMOS clinical trial, found that consuming around 500 milligrams of flavanols daily can significantly reduce the risk of dying from cardiovascular disease. However, the new study showed that many people fall far short of this target, even if they follow standard healthy eating advice such as consuming five portions of fruits and vegetables a day.

Researchers say the specific foods chosen make a substantial difference. Among the richest dietary sources of flavanols were plums, cranberries, blackberries, green tea, broad beans, cherries, apples with skin, strawberries, blueberries, and pinto beans. For example, a single cup of green tea can provide about 200 milligrams of flavanols, while a serving of blackberries contains approximately 250 milligrams.

According to the researchers, adding flavanol-rich foods to daily meals could be a simple way to improve heart health. A handful of berries, an apple with its skin, or a cup of green tea may help increase intake of these beneficial compounds.

The findings also raise questions about whether public health recommendations should move beyond general advice such as “five-a-day” and provide more guidance on the types of fruits and vegetables people choose. Scientists believe that as understanding of plant compounds grows, future dietary guidelines may become more specific, helping people make choices that offer greater protection against cardiovascular disease.

REFERENCE: Ottaviani, J. I., et al. (2026). Adhering to dietary guidelines does not yield flavanol intake levels associated with beneficial cardiovascular effects. Food & Function. DOI: 10.1039/D6FO00867D. https://pubs.rsc.org/en/content/articlelanding/2026/fo/d6fo00867d

Study Links Nitrate in Drinking Water to Higher Dementia Risk

A large long-term study suggests that where dietary nitrate comes from may influence brain health and dementia risk more than the amount consumed.

Researchers from Edith Cowan University and the Danish Cancer Research Institute followed more than 54,000 Danish adults for up to 27 years to examine how nitrate and nitrite intake from different sources affected the likelihood of developing dementia, including early-onset forms of the disease.

Their findings, published in the journal Alzheimer's, revealed a clear contrast: higher nitrate intake from vegetables was associated with a lower risk of dementia, while greater exposure to nitrate and nitrite from processed meats, animal-based foods, and drinking water was linked to a higher risk.

Scientists believe the difference may lie in how the body processes nitrate. Vegetables naturally contain vitamins, antioxidants, and other beneficial compounds that help convert nitrate into nitric oxide, a molecule that supports blood vessel and brain health.

These compounds may also prevent the formation of N-nitrosamines, potentially harmful substances that have been linked to cancer and brain damage. In contrast, animal-based foods lack these protective antioxidants and contain compounds such as heme iron that may promote N-nitrosamine formation.

The study found that people consuming higher amounts of vegetable-derived nitrate—roughly equivalent to one cup of baby spinach daily—had a lower risk of dementia. Meanwhile, higher intake of nitrate and nitrite from red and processed meats was associated with increased risk.

The findings suggest that the source of nitrate may play an important role in long-term brain health, reinforcing recommendations to eat more vegetables while limiting processed and red meat consumption.

REFERENCE: Catherine P. Bondonno, Pratik Pokharel, Dorit Wielandt Erichsen, Liezhou Zhong, Jörg Schullehner, Cecilie Kyrø, Kirsten Frederiksen, Peter Fjeldstad Hendriksen, Frederik Dalgaard, Lauren C. Blekkenhorst, Stephanie R. Rainey‐Smith, Samantha L. Gardener, Torben Sigsgaard, Ole Raaschou‐Nielsen, Anne Tjønneland, Jonathan M. Hodgson, Christina C. Dahm, Anja Olsen, Nicola P. Bondonno. Source‐specific nitrate intake and incident dementia in the Danish Diet, Cancer and Health Study. Alzheimer-'s, 2025; 21 (12) DOI: 10.1002/alz.70995

Ozempic-Like Weight-Loss Drugs Linked to 30% Lower Breast Cancer Risk: Study

A medication class widely used for weight management and type 2 diabetes may also hold promise for reducing breast cancer risk, according to new research presented at the 2026 American Society of Clinical Oncology Annual Meeting and published in JCO Oncology Practice.

Researchers analyzed health records of women aged 45 to 80 with overweight or obesity who underwent breast imaging between 2022 and 2025. They found that women who had been prescribed these medications were significantly less likely to develop breast cancer than those who had not used them.

The study included more than 111,000 women, of whom about 14% had received the treatment. After comparing breast cancer diagnoses between users and non-users, researchers observed a substantially lower likelihood of breast cancer among women taking the medications.

Scientists say the findings add to growing evidence that these medications may influence cancer risk through more than just weight loss. Excess body weight, particularly after menopause, is a well-established risk factor for breast cancer. However, researchers believe other mechanisms may also contribute. The drugs are known to reduce chronic inflammation, improve metabolic health, and affect biological pathways involved in cell growth and gene regulation—all factors that may play a role in cancer development.

Despite the encouraging results, researchers caution that the study was observational and cannot prove that the medications directly prevent breast cancer. Important factors such as duration of treatment, genetic risk, tumor subtype, and cancer stage were not evaluated.

Researchers are now planning larger clinical trials to determine whether these medications can actively reduce breast cancer risk in women considered at high risk for the disease.

If confirmed, the approach could offer a new avenue for breast cancer prevention alongside screening and existing risk-reduction strategies.

REFERENCE: Elizabeth S. McDonald, Laura B. Gillis, Peter Gabriel, Kham Xapakdy, Anthony Young, Abigail Doucette, Mitchell D. Schnall, John B. Buse, Etta D. Pisano. GLP-1 Agonists Are Associated With a Significant Reduction in Breast Cancer Incidence in Women. JCO Oncology Practice, 2026; DOI: 10.1200/OP-26-00485