A newly discovered species of Bartonella bacteria in Brazil’s Amazon sand flies shares DNA similarities with dangerous Andean strains. Scientists stress the need for further studies to see if it can infect humans and spread beyond its known regions.

Sucralose, the sugar substitute in many diet products, may weaken cancer immunotherapy by altering gut bacteria and reducing arginine levels needed for immune cells. But supplementation with arginine or citrulline could counteract this effect, pointing to new clinical trial possibilities.

Getting a smartphone before age 13 may drastically increase the risk of poor mental health later in life, according to data from more than 100,000 people. Early use is linked to suicidal thoughts, aggression, and detachment, largely driven by social media, cyberbullying, and lost sleep. Researchers urge urgent action to restrict access and protect young minds.

Hidden fat wrapped around organs, known as visceral fat, has now been linked to faster heart aging. Using AI and imaging from more than 21,000 people in the UK Biobank, scientists found that this invisible belly fat accelerates stiffening and inflammation of the heart, while fat stored around hips and thighs may actually protect women.

Scientists have uncovered a surprising way Parkinson’s disease may start: tiny toxic proteins that punch holes in brain cells like revolving doors. Instead of causing instant collapse, these flickering pores slowly weaken the cells, which could explain the gradual onset of symptoms.