Health & Medicine

1. Scientists warn a popular vitamin D supplement may have a hidden downside

   Not all vitamin D supplements are created equal, and new research suggests that one popular form may have an unexpected downside. Scientists found that taking vitamin D2 can actually lower the body's levels of vitamin D3, the form naturally produced by sunlight and more effective at boosting overall vitamin D. Previous studies also suggest that vitamin D3 may provide stronger immune protection against viruses and bacteria.

2. Taking antibiotics? Sugar may be making the damage worse

   Eating more sugar while taking antibiotics was linked to greater disruption of the gut microbiome and increased growth of potentially harmful bacteria. Researchers say temporarily cutting back on sweets during and after antibiotic treatment could be a simple way to reduce this damage, though clinical trials are still needed.

3. Not all trans fats are bad, major review finds

   A large analysis of 22 studies found that the trans fats naturally present in dairy foods such as milk, butter, yogurt, and cheese do not appear to raise the risk of heart disease or type 2 diabetes. Unlike industrial trans fats from partially hydrogenated oils, dairy trans fats showed no meaningful harmful effects on blood fats in controlled trials and were not linked to higher rates of heart disease, stroke, cardiovascular death, or diabetes in long-term studies.

4. Dads are dying after their kids are born, and almost no one is tracking it

   A study of more than 130,000 babies born in Georgia found that hundreds of fathers died within the first five years of their child’s life, and about 60% of those deaths were potentially preventable. Homicide, accidental injuries, suicide, and drug overdoses accounted for most of the preventable deaths, highlighting what researchers call a major blind spot in public health.

5. Stanford scientists turn a cancer driver into a kill switch

   A Stanford-designed molecule turns a major lymphoma-promoting protein against cancer cells, activating their own self-destruct machinery instead of simply blocking tumor growth. In mice, the treatment completely eliminated aggressive human lymphoma tumors within 11 days, although much more testing is needed before it could reach patients.

6. Scientists reprogram immune cells inside the body to fight cancer

   Scientists at UC San Francisco have developed a way to create cancer-fighting CAR-T cells directly inside the body, potentially avoiding the slow and extremely expensive process of removing, engineering, and reinfusing a patient’s immune cells. Using a two-particle delivery system, the researchers sent CRISPR gene-editing tools and new cancer-targeting DNA specifically into T cells, where the DNA was inserted at a precise location in the genome.

7. Drug target could block brain inflammation linked to Alzheimer’s and Parkinson’s

   Blocking a receptor called P2X7 significantly reduced inflammation in human brain tissue, revealing a potential new treatment strategy for neurological and psychiatric disorders. The discovery could help researchers repurpose existing drugs for conditions including traumatic brain injury, Alzheimer’s, Parkinson’s, depression, and schizophrenia.

8. Scientists reveal what seven days of fasting does to the human body

   Scientists found that prolonged fasting triggers major changes throughout the body, but many of the most interesting effects only appeared after about three days without food. The results suggest fasting may influence health in ways that go beyond weight loss and could eventually inspire treatments that mimic its effects.

9. A new way to fight gum disease without wiping out good bacteria

   Scientists discovered that disrupting the chemical messages bacteria use to communicate can push dental plaque toward a healthier microbial balance. The approach could lead to new treatments for gum disease that control harmful bacteria without destroying beneficial species.

10. Goodbye joint replacements? Stanford scientists found a way to regrow cartilage and stop arthritis

    Scientists have found a surprising way to regrow damaged knee cartilage by blocking a protein that becomes more abundant with age. In old mice, the treatment restored naturally lost cartilage and also helped prevent osteoarthritis after ACL-like knee injuries, while human cartilage taken from knee replacement patients began producing new, functional joint cartilage after exposure to the same inhibitor.

11. Scientists say this simple habit could strengthen your marriage

    Couples who exercise together report better communication, healthier conflict resolution, and lower marital stress than those who work out alone. Even something as simple as taking a walk together may create valuable opportunities to talk, listen, and feel more connected.

12. What happens in the brain when cannabis makes you anxious?

    Cannabinoids may intensify anxiety by removing a natural brake on specific neurons in the brain’s fear center, particularly during stressful situations. In mice, shutting down those neurons sharply reduced cannabinoid-related anxious behavior.

13. Colorectal cancer is rising in young people and often found too late

    Colorectal cancer in young people is often diagnosed at an advanced stage, with researchers finding most patients age 21 or younger already had Stage III or IV disease. Because symptoms like rectal bleeding, weight loss, abdominal pain, and bowel changes may be overlooked, researchers are calling for greater vigilance.

14. One simple addition to postpartum care made a major difference

    New mothers paired with patient navigators were much more likely to receive postpartum care, depression screening, preventive testing, and ongoing primary care. By helping with barriers such as transportation, childcare, scheduling, and confusing medical information, navigators may provide a powerful way to improve women’s long-term health.

15. MIT scientists find a hidden cancer risk of the keto diet

    A ketogenic diet increased small-intestinal tumors in cancer-prone mice while reducing tumors in the colon, revealing a strikingly different response within neighboring parts of the gut. Researchers traced the increased risk not to ketones, but to the way intestinal stem cells processed the diet’s high levels of fat. That fat-burning activity pushed the cells to multiply more rapidly, potentially raising the chance of cancerous changes.