Health & Medicine

1. Only one workout helped older adults lose fat and keep muscle

   A six-month study suggests that high-intensity interval training (HIIT) may offer older adults a powerful advantage: losing body fat while keeping their muscle. Unlike moderate-intensity workouts, which led to a small loss of lean muscle, HIIT preserved it while also improving body composition around the waist.

2. 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.

3. Bacteria turn a virus’ own weapon against it

   Researchers have uncovered a new way bacteria detect viral attacks: a virus-produced enzyme cuts a bacterial sensor protein, triggering a self-destructing immune response. The discovery could lead to more effective phage therapies against antibiotic-resistant bacteria and provide insight into ancient immune mechanisms shared with humans.

4. 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.

5. Scientists tested 5 natural compounds on cancer cells. One stood out

   Five natural compounds, including curcumin and berberine, were tested for their effects on cancer cells and healthy muscle cells. All disrupted cancer cell energy production and pushed many of the cells into a non-dividing state, with curcumin producing the strongest overall effect. Curcumin also showed a relatively favorable safety profile, while some other compounds caused more toxicity.

6. FDA-approved epilepsy drug may help reverse osteoarthritis damage

   Researchers at Yale have identified a promising new approach to osteoarthritis that could do more than simply ease pain. The epilepsy drug lacosamide appears to block a protein involved in both pain signaling and cartilage destruction, helping damaged joints shift back toward repair in preclinical studies.

7. Nearly 30,000 people tested quit-smoking methods. One stood out

   Nicotine e-cigarettes appear to help more smokers quit than patches, gum, and several other common approaches, according to a major review of 80 clinical trials. Researchers say regulated vaping products are not risk-free, but may be a significantly less harmful alternative for people who would otherwise continue smoking.

8. Just 7 days of strength training started shrinking fat cells in mice

   Just seven strength-training sessions helped obese mice shrink visceral fat cells and reactivate molecular pathways involved in burning stored fat, despite no change in overall body weight. The findings suggest some benefits of resistance exercise may begin long before weight loss becomes visible, though the results still need to be confirmed in humans.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

15. 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.