(HealthDay News) -- Exercise can help improve many symptoms of osteoarthritis, a joint disease that causes pain and stiffness.

(HealthDay News) -- Gestational diabetes occurs when blood sugar levels become abnormally high during pregnancy.

THURSDAY, Sept. 29 (HealthDay News) -- Campus-wide smoking bans appear to help university students cut back on their nicotine habit, new research suggests.

THURSDAY, Sept. 29 (HealthDay News) -- Picky eating is normal in children, but a pediatric feeding disorder is a much more serious problem that can affect a child's physical and mental development, an expert says.

THURSDAY, Sept. 29 (HealthDay News) -- The bellowing of male koalas during mating season is a boast about their size, researchers report.

THURSDAY, Sept. 29 (HealthDay News) -- New genes associated with type 1 diabetes have been uncovered in a large-scale analysis of genetic data related to the disease.

THURSDAY, Sept. 29 (HealthDay News) -- Brain development doesn't stop in adolescence, but continues until people are well into their 20s, a new study says.

THURSDAY, Sept. 29 (HealthDay News) -- Singing helps some stroke patients suffering from non-fluent aphasia -- severe difficulties with speech -- re-learn how to speak, according to a new study.

THURSDAY, Sept. 29 (HealthDay News) -- A loss of a sense of smell can be one of the earliest signs of Alzheimer's disease.

THURSDAY, Sept. 29 (HealthDay News) -- Men over 75 with prostate cancer who are otherwise healthy are being undertreated for their condition, according to a new study.

THURSDAY, Sept. 29 (HealthDay News) -- Working rotating shifts is not as potentially unhealthy as it used to be, according to new Canadian research that suggests modern shift patterns may not carry the same risks for cancer as older, more extreme shift schedules.

THURSDAY, Sept. 29 (HealthDay News) -- Using Twitter to track people's moods from every corner of the globe, new research suggests that folks seem to awaken in good cheer and get grumpier as the workday progresses, regardless of where they live.

THURSDAY, Sept. 29 (HealthDay News) -- The U.S. Food and Drug Administration is once again cracking down on eye care professionals who make false safety claims and promises about the popular LASIK eye surgery.

THURSDAY, Sept. 29 (HealthDay News) -- In new research that will almost certainly create controversy, scientists working with the hallucinogen psilocybin -- the active ingredient found in "magic mushrooms" -- have found that a single dose of the drug prompted an enduring but positive personality change in almost 60 percent of patients.

THURSDAY, Sept. 29 (HealthDay News) -- One-quarter of American adults received treatment for high blood pressure in 2008, according to new research from the U.S. Agency for Healthcare Research and Quality.

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

THURSDAY, Sept. 29 (HealthDay News) -- Almost 20 percent of American workers are smokers, particularly the least educated, poorest, youngest and uninsured, a new government report finds.

THURSDAY, Sept. 29 (HealthDay News) -- Medications are effective for most patients with acid reflux disease, but some surgical options may be just as effective, according to a review of studies on current treatments for this common condition.