Daniel Borch Ibsen, Aarhus University; Christina C. Dahm, Aarhus University, and Michael Fridén, Aarhus University
We live in Denmark, which consistently ranks as one of the world’s healthiest countries. The modern Danish diet, however, may not be quite so world-leading – with many Danes consuming high levels of sugar, salt and convenience food.
Ramon Sun, University of Florida
People with Alzheimer’s disease who took the common supplement glucosamine were 25% more likely to die within five years than those who didn’t. That’s the key finding of a new study that my colleagues and I published in the journal Nature Metabolism.
Zachary W. Binder, UMass Chan Medical School
After a sharp uptick in flu cases in mid-December 2025, flu activity across the U.S. and Canada remains high.
Morgan Underwood, Rice University
When astronomers search for planets that could host liquid water on their surface, they start by looking at a star’s habitable zone. Water is a key ingredient for life, and on a planet too close to its star, water on its surface may “boil”; too far, and it could freeze. This zone marks the region in between.
Each summer in the mountains above Juneau, Alaska, meltwater from the massive Mendenhall Glacier flows into mountain lakes and into the Mendenhall River, which runs through town.
Susan Yeargin, University of South Carolina
When summer starts with a stifling heat wave, as many places are seeing in 2025, it can pose risks for just about anyone who spends time outside, whether they’re runners, people who walk or cycle to work, outdoor workers or kids playing sports.
Susan Yeargin, an expert on heat-related illnesses, explains what everyone should think about before spending time outside in a heat wave and how to keep yourself and vulnerable family members and friends safe.
Christine Bryson, Anglia Ruskin University
Gum diseases are among the most common chronic human diseases, affecting between 20 to 50% of people worldwide. They happen when plaque, a sticky film of bacteria, builds up on teeth. The earliest stages of gum disease are treatable and reversible (gingivitis). But some people develop a chronic destructive form of gum disease, which is irreversible. This disease progresses to tooth loss. A growing body of evidence shows that gum disease can also make people more likely to develop other serious health conditions.
