AI gives 3D bioprinters “eyes and brains” to build living tissue; rugby linked to higher dementia risk; few Americans with high blood pressure use salt substitutes – Morning Medical Update

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AI gives 3D bioprinters “eyes and brains” to build living tissue

Researchers at University Medical Center Utrecht have reached a breakthrough in 3D bioprinting: a printer that doesn’t just build but also “sees” and adapts designs in real time using artificial intelligence (AI) and laser imaging. The new system, called “GRACE,” improves survival and function of printed cells, offering a faster, gentler way to create blood vessels and complex tissues — a step toward future organ repair and replacement. Read more in Nature.

Rugby linked to higher dementia risk

Former high-level rugby players in New Zealand face a 22% higher risk of Alzheimer’s and other dementias compared to men in the general population, according to a University of Auckland study of nearly 13,000 men, published in Sports Medicine. The risk was greatest for “backs” — positions akin to wide receivers and defensive backs in American football, who take frequent high-speed hits. The elevated risk emerged mainly after age 70, underscoring growing evidence that repeated head impacts in contact sports carry long-term brain health consequences.

Few Americans with high blood pressure use salt substitutes

Fewer than 6% of U.S. adults report using salt substitutes, despite their effectiveness in lowering sodium and managing blood pressure, researchers reported at the American Heart Association’s Hypertension Scientific Sessions 2025. Even among people with uncontrolled hypertension, use was uncommon, highlighting a missed opportunity to reduce heart attack and stroke risk.