Medical Bulletin 28/March/2026

Here are the top medical news for today:

Study Links Obesity-Driven Organ Enlargement to Increased Risk of Cancer Development

Scientists at City of Hope and Translational Genomics Research Institute have identified a key biological mechanism explaining how obesity increases cancer risk. The study, published in Cancer Research, shows that excess body weight can physically enlarge organs, increasing the likelihood of cancer development.

According to senior author Cristian Tomasetti, obesity does more than alter metabolism or hormones—it drives organ growth by increasing the number of cells. As body weight rises, organs such as the liver, kidneys, and pancreas expand to meet higher energy demands. This growth occurs mainly through hyperplasia (an increase in cell number), rather than just enlargement of existing cells.

To investigate, researchers analyzed 747 adults across a wide body mass index (BMI) range using CT scans. They found that for every 5-point increase in BMI, the liver enlarged by 12%, kidneys by 9%, and pancreas by 7%. Further tissue analysis revealed that over 60% of kidney growth was due to an increase in cell, confirming that obesity significantly raises the number of cells within organs.

This increase in cell count is critical because cancer often arises from DNA errors during cell division. With more cells present, the probability of mutations rises—similar to increasing chances in a lottery. The study confirmed a strong link between enlarged organ size and higher cancer risk.

Importantly, the findings suggest that BMI alone may not accurately predict cancer risk, as it does not reflect organ size or composition. Researchers emphasize maintaining a healthy weight from early life, as prolonged obesity allows more time for harmful mutations to accumulate, increasing long-term cancer risk.

REFERENCE: Sophie Pénisson, Maren Weischer, Lu Li, Yifan Zhang, Haley Grant, Ruihan L. Yuan, Kevin M. Arnold, Mete Mülazımoğlu, Yan Wang, Satomi Kawamoto, Daniel Fadaei. Fouladi, Shahab Shayesteh, Alejandra Blanco, Saeed Ghandili, Eva Zinreich, Jefferson S. Graves, Syed Rahmanuddin, Scott E. Kern, Pei-Hsun Wu, Jody E. Hooper, Alan Yuille, Elliot K. Fishman, Linda Chu, Cristian Tomasetti; Hyperplasia Functions as a Link Between Obesity and Cancer. Cancer Res 2026; https://doi.org/10.1158/0008-5472.CAN-25-2487

Researchers Find Active Mind During Sitting Tied to Reduced Dementia Risk

A new study published in American Journal of Preventive Medicine highlights that not all sitting behaviors carry the same risk for Dementia. Researchers found that mentally passive sedentary activities-such as watching television-are linked to a higher risk of dementia, while mentally active behaviors like reading or desk work may help reduce that risk.

Led by Mats Hallgren from Karolinska Institute, the study analyzed data from over 20,800 adults aged 35–64 years over a 19-year period. The researchers examined how different types of sedentary behavior influenced long-term cognitive health. Dementia cases were identified through national health and mortality records, ensuring robust longitudinal tracking.

The findings showed that individuals who spent more time in mentally passive activities had a significantly higher likelihood of developing dementia. In contrast, increasing time spent in mentally engaging sedentary activities was associated with a lower risk—even when overall sitting time remained the same. Importantly, replacing passive sitting with mentally active tasks led to measurable reductions in dementia risk.

These results challenge the long-standing assumption that all sedentary behavior is equally harmful. While prolonged sitting is already linked to conditions like cardiovascular disease and type 2 diabetes, this study suggests that brain engagement during sedentary time plays a crucial role in cognitive outcomes.

Globally, dementia remains a leading cause of disability and mortality among older adults, making prevention strategies essential. The study emphasizes that sedentary behavior is a modifiable risk factor. Staying physically active is important, but maintaining mental engagement—even while sitting—may be equally critical for protecting long-term brain health and reducing dementia risk.

REFERENCE: Werneck, A. O., et al. (2026). Mentally Active Versus Passive Sedentary Behavior and Risk of Dementia: 19-Year Cohort Study. American Journal of Preventive Medicine. DOI: 10.1016/j.amepre.2026.108317. https://www.ajpmonline.org/article/S0749-3797(26)00060-7/fulltext

Study Suggests Eating Same Meals Daily May Support Greater Weight Loss Outcomes

A study published by the American Psychological Association in the journal Health Psychology suggests that consistency in eating habits may play a key role in successful weight loss. Researchers found that individuals who followed routine meal patterns and maintained stable calorie intake lost more weight than those with highly varied diets.

Led by Charlotte Hagerman at the Oregon Research Institute, the study analyzed real-time food logs from 112 overweight or obese adults enrolled in a 12-week behavioral weight loss program. Participants tracked their daily food intake using a mobile app and recorded their weight through wireless scales, allowing researchers to closely monitor dietary habits and outcomes.

The researchers evaluated “diet routinization” using two measures: caloric stability and dietary repetition. Caloric stability referred to how consistent daily calorie intake was, while dietary repetition measured how often participants consumed the same meals over time.

Those who maintained consistent calorie intake and frequently repeated meals lost an average of 5.9% of their body weight, compared to 4.3% among those with more varied diets. Additionally, every 100-calorie increase in daily fluctuation was associated with a 0.6% decrease in weight loss.

The findings suggest that simplifying food choices—such as rotating a set of regular meals—may reduce decision fatigue and improve adherence to healthy eating patterns. However, researchers note that the study shows correlation, not causation, and factors like motivation and self-discipline may also influence results.

While dietary variety is generally linked to better nutrition, in modern food environments, consistency may be more effective for weight loss.

REFERENCE: Hagerman, C. J., et al. (2026). Do routinized eating behaviors support weight loss? An examination of food logs from behavioral weight loss participants. Health Psychology. DOI: 10.1037/hea0001591. https://www.apa.org/pubs/journals/releases/hea-hea0001591.pdf