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The agency said it denied Moderna's application because it refused to follow "very clear" guidance. The drugmakers says the FDA approved the design of its clinical trial.

New research shows that whole grains and plant-based foods, what researchers call a "quality" diet, are key to lowering the risk of coronary heart disease.

Vonn, the 41-year-old legendary skier, was competing in the Alpine women's downhill event on Sunday when she clipped a pole and crashed less than 15 seconds into her run.

Under Health Secretary Robert F. Kennedy Jr., the Food and Drug Administration has taken an aggressive stance against mRNA technology.

The disputes stem from rising health care costs, with insurers and hospitals fighting more aggressively over the price of care.

The preservative has been identified as a possible human carcinogen by the National Toxicology Program.

Researchers who tracked thousands of participants over two decades found that brain training video games may help protect the brain against dementia. NBC News' Erika Edwards spoke with a woman who says a video game has changed her life.

People who drank the most caffeinated coffee had a lower risk of dementia compared to those who drank the least, the long-term observational study found.

Recent research suggests that more people should be screened for a protein called apoB. A growing number of doctors agree.

Vonn will compete in the women's downhill only nine days after shredding a crucial ligament in her left knee.