(HealthDay News) -- Seasonal affective disorder (SAD) is characterized by a series of mood changes that appear year after year as the seasons change -- most often as the weather gets colder.

(HealthDay News) -- Foods that bear the label "organic" must meet standards set by the U.S. Department of Agriculture, chiefly that they must be grown without the use of chemicals or pesticides.

THURSDAY, Jan. 10 (HealthDay News) -- People with brown eyes are generally considered more trustworthy than those with blue eyes, a new study suggests.

THURSDAY, Jan. 10 (HealthDay News) -- People who tune in to reality beauty shows on television are much more likely to use tanning lamps and to tan outdoors than those who don't watch such shows, a new study finds.

THURSDAY, Jan. 10 (HealthDay News) -- A new survey challenges the notion that avid video gamers are antisocial loners. On the contrary, the findings suggest that gaming is actually a way to stay connected with friends and strengthen, rather than weaken, social ties.

THURSDAY, Jan. 10 (HealthDay News) -- Being bored at work may boost some people's creativity because it gives them time to daydream, new research suggests.

THURSDAY, Jan. 10 (HealthDay News) -- Despite the fact that an increasing number of Americans are overweight and obese, there's been a decrease in weight counseling offered by primary care doctors, according to a new study.

THURSDAY, Jan. 10 (HealthDay News) -- Taking early and repeated white blood cell counts is vital in diagnosing whooping cough (pertussis) in infants and identifying which of them have the highest risk of dying from the respiratory infection, according to a new study.

THURSDAY, Jan. 10 (HealthDay News) -- Amid signs of a growing shortage of primary care physicians in the United States, a new study shows that the majority of newly minted doctors continues to gravitate toward training positions in high-income specialties in urban hospitals.

WEDNESDAY, Jan. 9 (HealthDay News) -- As part of an effort to control the misuse of prescription narcotic painkillers, the U.S. Food and Drug Administration is calling on drug makers to study formulations of the medications that would deter people from abusing them.

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

THURSDAY, Jan. 10 (HealthDay News) -- Prescription painkillers are second only to marijuana when it comes to drug abuse, a new government report claims.

THURSDAY, Jan. 10 (HealthDay News) -- With the United States in the throes of one of the worst flu outbreaks in years, health-care experts say there are ways you can fight back and protect yourself from the virus.