A five-year study conducted at the University of Eastern Finland found that higher-than-recommended doses of vitamin D reduced the risk of atrial fibrillation in older men and women. Atrial fibrillation is a common arrhythmia associated with an increased risk of stroke, heart failure, and mortality. The study involved 2,495 participants aged 60 or older (men) and 65 or older (women) who were randomly assigned to placebo or two vitamin D3 supplementation groups. Those taking 40 micrograms per day had a 27% lower risk, and those taking 80 micrograms per day had a 32% lower risk of atrial fibrillation compared to the placebo group. However, further confirmation is needed before recommending higher vitamin D doses for preventing atrial fibrillation.

Regular physical activity may help protect against cognitive decline in older adults, but this benefit may be compromised if individuals do not get enough sleep, as per a study by UCL researchers. The research, published in The Lancet Healthy Longevity, followed 8,958 individuals aged 50 and over in England for 10 years, examining the relationship between sleep, physical activity, and cognitive function. Participants who were physically active but had short sleep durations (less than six hours) experienced faster cognitive decline compared to those who engaged in less physical activity. The study underscores the importance of considering both sleep and physical activity in maintaining cognitive health as we age.

Schizophrenia, a psychiatric disorder with adult onset, is influenced by both environmental factors and genetics. A study published in Cell Genomics reveals a correlation between schizophrenia and somatic copy-number variants (mutations occurring after genetic material is inherited). The research examined genotype-marker data from over 20,000 blood samples, identifying two genes, NRXN1 and ABCB11, associated with schizophrenia when disrupted in utero. NRXN1, linked to schizophrenia before, was now associated with somatic, not inherited, mutations. ABCB11, known for encoding a liver protein, was unexpectedly found to be expressed in specific dopamine-carrying neurons related to schizophrenia drug targets. This study expands the understanding of psychiatric disorders and opens new avenues for research into acquired mutations’ roles in various disorders.

Scientists have discovered that differences in gut bacteria are linked to the development of juvenile idiopathic arthritis (JIA) in children, even years before symptoms appear. The research analyzed stool samples from one-year-old children participating in a long-term study. Children with gut bacteria known to cause inflammation were nearly seven times more likely to develop JIA, while those with bacteria promoting a healthy gut lining were reduced. The findings offer potential for early disease risk indicators and alternative approaches for JIA treatment. Researchers aim to understand how these bacteria contribute to the disease and explore microbial differences associated with other childhood conditions. 

New research from the University of Exeter, Exeter Clinical Research Facility, and the University of Bristol reveals that obesity risk genes can heighten feelings of hunger and lack of control overeating. However, the study suggests that practicing dietary restraint, such as both flexible strategies (conscious eating and smaller servings) and rigid approaches (calorie counting), can mitigate the effects of these genes by up to half. The research, conducted on 3,780 adults from two UK cohorts, found that high genetic risk scores were associated with higher BMI due to increased disinhibition and hunger. By understanding these gene influences, restraint-based interventions could be developed to address obesity risk in genetically susceptible individuals.