24% of girls aged 15 to 19 who have been in a relationship have experienced physical or sexual violence by a male partner at some point in their lives, according to a global study with data from 161 countries between 2000 and 2018. Spain is in the group with the lowest prevalence (12% over their lifetime; 4% in the previous year), according to 2015 data. There is less violence against girls in countries with higher incomes, higher rates of girls in secondary education, and greater gender equality in inheritance laws, says the study published in The Lancet Child & Adolescent Health. 

Eating a vegan diet for eight weeks is associated with reductions in biological age estimates based on levels of DNA methylation, a type of chemical modification of DNA that alters the expression of genes, but not the DNA itself. This is the main conclusion of a study published in BMC Medicine in which 21 pairs of twins participated in a clinical trial. Of each pair, one person followed an omnivorous diet and the other a vegan - and lower calorie - diet during that period.

The European Medicines Agency (EMA) has recommended not granting marketing authorization for Leqembi™ (lecanemab) for the treatment of Alzheimer's disease. The EMA's Committee for Medicinal Products for Human Use (CHMP) considers that its effect in delaying cognitive decline does not outweigh the risk of serious side effects associated with the drug, in particular swelling and possible bleeding in patients' brains. Leqembi™ was approved in 2023 in the United States.

After the introduction of a shingles vaccine (Zostavax) in 2006, several studies suggested that the risk of dementia might be lower in people who had received the vaccine, although the results were inconclusive. In many countries Zostavax has been withdrawn and replaced by a much more effective vaccine (Shingrix). A study published today in Nature Medicine suggests that this new recombinant shingles vaccine, Shingrix, is associated with a greater reduction in the risk of dementia compared to Zostavax and vaccines against other types of infections.

Studies associating the consumption of low amounts of alcohol with health benefits are not of good scientific quality, says a meta-analysis pooling the findings of 107 previous papers. For example, studies may use a reference group of older adults who have given up or limited alcohol for health reasons. Compared to those who continue to drink, the latter appear to be in better health, notes the article, published in the Journal of Studies on Alcohol and Drugs.

Japanese scientists have developed tiny liver organoids from stem cells that, transplanted into mice, integrate with the original organ and help repair fibrotic lesions. This scar-like tissue damage is common to many liver diseases, such as fatty liver disease and cirrhosis. According to the authors, who publish their results in the journal Science Translational Medicine, such organoids could offer an alternative to liver transplants in the future.

Using artificial intelligence (AI)-generated datasets to train future generations of machine learning models can contaminate their results, a concept known as ‘model collapse’, according to a paper published in Nature. The research shows that, within a few generations, original content is replaced by unrelated nonsense, demonstrating the importance of using reliable data to train AI models.

The surface of tree bark plays an important role in the elimination of methane gas from the atmosphere thanks to the microorganisms that live on it, according to a study published today in Nature in which CREAF participates. Methane is one of the gases responsible for the greenhouse effect. The authors estimate that this process, unknown until now, makes trees 10% more beneficial to the climate than previously thought.

A team led by the Carlos III Health Institute has analyzed how short-term concentrations of particles associated with wildfires and Saharan dust incursions influence hospital admissions in Spain due to mental and behavioral disorders. The results were explained in a briefing organized by the Science Media Centre Spain. 

The use of faecal immunochemical testing (FIT) for colorectal cancer screening is associated with a 33% reduction in the risk of death from colorectal cancer, a study claims. The research, published in JAMA Network Open, analysed data from more than 10,000 people aged 52-85 in the US.