Medical Bulletin 01/April/2026

Here are the top medical news for today:

Researchers Examine Impact of Lifestyle Factors on Female Microbiome Composition and Function

A comprehensive review published in Microbial Ecology highlights how modifiable lifestyle behaviors significantly influence the female microbiome across multiple body sites. The analysis examined factors such as diet, smoking, alcohol use, obesity, stress, physical activity, and hygiene, showing that these behaviors can alter microbial diversity and function, with important implications for women’s health.

Emerging evidence confirms that women exhibit unique microbial patterns, largely influenced by hormonal fluctuations.

In the vaginal microbiome, dominance of Lactobacillus is considered a hallmark of a healthy state, while imbalance—known as dysbiosis—is linked to conditions such as Pelvic Inflammatory Disease, sexually transmitted infections, endometriosis, and preterm birth.

The review synthesized findings across four major microbiome sites: vaginal, gut, oral, and skin. Diet emerged as a key factor, with high-fiber intake associated with beneficial microbial profiles and reduced risk of bacterial vaginosis.

These effects may be mediated through short-chain fatty acids and hormonal regulation. In contrast, alcohol consumption and smoking were linked to reduced Lactobacillus levels and increased microbial imbalance.

Obesity also showed strong associations with microbiome disruption, including unfavorable bacterial shifts in both gut and vaginal environments. Hygiene practices, particularly the use of vaginal cleaning products, were associated with a higher risk of infections such as urinary tract infections. Stress was identified as another important factor, potentially disrupting microbial balance through hormonal pathways involving cortisol.

Overall, the findings emphasize that lifestyle choices play a crucial role in shaping the female microbiome. Positive behaviors like healthy diet and physical activity may support microbial balance, while harmful habits can promote dysbiosis.

REFERENCE: M. Davidson, I., Nikbakht, E., M. O’Neill, H. et al. Shaping the Female Microbiome: A Review of Lifestyle Factors Influencing the Vaginal, Gut, Oral, and Skin Microenvironments. Microb Ecol (2026). DOI: 10.1007/s00248-026-02747-w, https://link.springer.com/article/10.1007/s00248-026-02747-w

Researchers Warn Excess Sugar May Increase Gallstone Risk in Adults

A new study published in Scientific Reports suggests that higher dietary sugar intake may significantly increase the risk of Gallstones among adults. The findings, based on data from the National Health and Nutrition Examination Survey (NHANES) between 2017 and 2023, highlight excessive sugar consumption as a potential and modifiable risk factor.

Researchers analyzed 8,975 adults and found that every 100 grams per day increase in total sugar intake was associated with a 41% higher risk of gallstones, even after adjusting for factors such as age, sex, body mass index (BMI), lifestyle, and comorbidities.

Participants with gallstones were more likely to be older, physically inactive, obese, and smokers, and they often had lower income levels and higher rates of chronic diseases.

Further analysis showed that individuals in the highest sugar intake groups had up to 82% greater risk compared to those consuming the least sugar.

Machine learning models confirmed the strength of this association, with sugar intake emerging as an important predictor, although factors like age, sex, and BMI had an even greater impact.

Several biological mechanisms may explain this link. High sugar intake can raise blood glucose and insulin levels, increasing liver cholesterol production and its release into bile. This can lead to bile supersaturation, a key step in gallstone formation.

Additionally, excessive sugar may contribute to insulin resistance, obesity, reduced gallbladder movement, and chronic inflammation—all of which can promote stone development.

While the study does not establish causation due to its cross-sectional design, it underscores the importance of dietary habits.

Reducing sugar intake could serve as a practical strategy to lower gallstone risk and improve overall metabolic health, though further long-term research is needed.

REFERENCE: Zhang, J., Lu, Y., Zhou, X. et al. (2026). Association between total dietary sugar intake and gallstones in Americans. Scientific Reports. DOI: 10.1038/s41598-026-44407-6, https://www.nature.com/articles/s41598-026-44407-6

Study Examines How Video Gaming Influences Sleep, Diet and Physical Activity Across Lifespan

A recent review published in Nutrients examines how video gaming influences lifestyle behaviors, including diet, sleep, physical activity, and psychosocial stress. With over 3.3 billion gamers worldwide, understanding these effects is increasingly important for public health.

The review synthesized studies from 2000 to 2025, analyzing experimental, longitudinal, and cross-sectional research. Findings suggest that gaming has a complex, bidirectional relationship with health.

On the positive side, gaming can reduce stress, improve mood, and foster social connections. For some individuals, it serves as a cognitive distraction that promotes relaxation and emotional well-being.

However, excessive gaming may negatively affect multiple lifestyle factors. Most games are sedentary, contributing to reduced physical activity through the “displacement effect,” where gaming replaces time that could be spent exercising.

Although active gaming (exergaming) can improve fitness, long-term engagement tends to be limited.

Sleep is another key concern. Evening gaming is associated with delayed sleep onset, poorer sleep quality, and increased fatigue. Exposure to blue light from screens can suppress melatonin production, while mental stimulation from gameplay may make it harder to fall asleep.

Dietary habits are also affected. Gaming can promote “mindless eating,” where players consume more high-calorie snacks and sugar-sweetened beverages while distracted. Skipping meals or eating late is also common, further contributing to poor nutrition.

These behaviors are interconnected. Poor sleep can influence food choices, while low physical activity and unhealthy diets may increase the risk of weight gain and metabolic issues.

The study uses a biopsychosocial model to explain how biological, psychological, and environmental factors interact to shape these outcomes.

Overall, gaming can offer mental health benefits when used in moderation, but excessive use is linked to unhealthy lifestyle patterns. Researchers emphasize the need for long-term studies and strategies to promote balanced gaming habits.

REFERENCE: Deric, S., Kaewpradup, T., Adisakwattana, S., Stirling, E., Stephan, B., Nguyen, V., Radin Pereira, L., Uren, H. V., & Siervo, M. (2026). A Critical Appraisal of the Links Between Video Gaming, Lifestyle Factors, Diet and Eating Behaviour: A Narrative Review. Nutrients, 18(6). DOI: 10.3390/nu18060967, https://www.mdpi.com/2072-6643/18/6/967