A coalition of nutrition experts and groups, including several federal agencies on Thursday challenged government warnings that pregnant women limit their fish consumption because of contamination.

  The Ornish diet is the heart-healthiest weight-loss plan, finds a study in the Journal of the American Dietetic Association.

  The H. pylori bacterium can cause ulcers, but kids with H. pylori may be less likely to have asthma, a study shows.

  In stressful situations, the stress hormone norepinephrine may prime the brain to remember what went wrong, scientists report in Cell.

  The CDC reports that 37% of U.S. adults with disabilities don't get enough physical activity, compared to about half of other adults.

  Rocky Mountain spotted fever, caused by bacteria carried by certain ticks, is rising, including in the suburbs, researchers report.

  Plasma from people who have survived bird flu (avian influenza) may help treat bird flu patients, Chinese doctors report.

  Experts offer WebMD tips for investing in your marriage so you can worry less about your money.

  President Bush vetoed an expansion of government-funded health insurance for children Wednesday, setting up a congressional fight to try to override it.

  Virtual colonoscopy -- examining the colon via CT scan and special imaging software -- finds cancer as well as regular colonoscopy, a study shows.

  The Alzheimer's drug Aricept may not soothe agitation in patients with severe Alzheimer's disease, a British study shows.

  Giving flu shots to older adults is a highly effective way to prevent influenza and pneumonia-related hospitalizations and death in this highly vulnerable population, a new study shows.

  Watching smoking on screen makes young adults more likely to smoke themselves, researchers report in American Journal of Preventive Medicine.

  A new hot-chili-pepper-based anesthetic may offer better pain relief during childbirth, surgery, or other painful situations than conventional anesthetics.