Study suggests passage through birth canal confers protective gut bacteria to newborns

Study found exercise, healthy diet could lower odds for heart attack even in those at high genetic risk

Study found bigger threat for those with more than pack-a-day habit

Some may need convincing of value of giving up the habit, one geriatrician said

Researchers chalk it up to better meds, prevention efforts

Inherited distaste for bitterness could make people reach for the shaker, putting heart at risk

Study found risk doubled among young users, but cause-and-effect not proven

Small study suggests real improvement for some patients, but more follow-up research is needed

Those already taking the cholesterol-lowering drugs were more likely to be alive one year later, study says

Trend popular because advocates say practice speeds recovery after childbirth, boosts mothers' mood and energy