THURSDAY, May 23 (HealthDay News) -- Statins are proven drugs taken by millions to lower their cholesterol, but the medications also could hamper heart patients' ability to improve their cardiovascular health through exercise, researchers say.

THURSDAY, May 23 (HealthDay News) -- Schools should ensure that kids get at least one hour of physical activity each day to support their health and boost performance in school, according to a new report.

THURSDAY, May 23 (HealthDay News) -- Mild to moderate iodine deficiency during pregnancy may have a negative long-term impact on children's brain development, British researchers report.

THURSDAY, May 23 (HealthDay News) -- People who suffer from frequent heartburn may be at increased risk for cancers of the throat and vocal cords even if they don't smoke or drink alcohol, a new study says.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

THURSDAY, May 23 (HealthDay News) -- Teen birth rates in the United States are dropping sharply, especially among Hispanic teens, according to a new government report.

THURSDAY, May 23 (HealthDay News) -- While some fast-food chains are required to provide calorie and other nutritional information to help customers make informed choices, kids who eat fast food at least twice a week are 50 percent less likely to use this information than kids who eat fast food less often, according to a new U.S. study.

(HealthDay News) -- Baby's sensitive skin can break out in a heat rash when exposed to hot, humid weather, as the sweat gland openings become blocked.

(HealthDay News) -- While the United States has among the world's safest supplies of drinking water, some Americans still ask, "Is my drinking water safe?"

WEDNESDAY, May 22 (HealthDay News) -- Man's best friend may bring millions more microscopic pals into the average human home, a new study suggests.

WEDNESDAY, May 22 (HealthDay News) -- The success of an imaginative and resourceful device used to save an infant born with a serious airway malformation sheds light on new technology created by the marriage of bioengineering and surgery.

WEDNESDAY, May 22 (HealthDay News) -- Physicians weighing the benefits and risks of CT scans for detecting lung cancer now have more information to help with the decision. A new analysis of a 2010 U.S. study finds that low-dose CT scans pick up significantly more lung tumors than chest X-rays do.

WEDNESDAY, May 22 (HealthDay News) -- People who endure chronic migraines or back pain are more likely to attempt suicide, whether or not they also suffer from depression or another psychiatric condition, according to a new study.

WEDNESDAY, May 22 (HealthDay News) -- Migraines and depression can each cause a great deal of suffering, but new research indicates the combination of the two may be linked to something else entirely -- a smaller brain.

WEDNESDAY, May 22 (HealthDay News) -- Anyone who has ever wrestled with athlete's foot knows there is something about feet that fungi seem to like. But scientists now have the first detailed "map" of the fungal groups that live on your skin -- and, yes, your feet are the hottest neighborhood.

WEDNESDAY, May 22 (HealthDay News) -- The American Cancer Society, which is celebrating on Wednesday a century of fighting a disease once viewed as a death sentence, is making a pledge to put itself out of business.

WEDNESDAY, May 22 (HealthDay News) -- Fish oil supplements could help reduce the risk for type 2 diabetes, new research suggests.

WEDNESDAY, May 22 (HealthDay News) -- In the aftermath of this week's deadly tornado, many people in Oklahoma are not only struggling to care for children and relatives, but also their pets.

WEDNESDAY, May 22 (HealthDay News) -- People with heart failure are more likely to experience poorer health from having a thyroid gland that is even mildly underactive, according to a new study.