As the American Psychiatric Association unveils the latest edition of what is considered the “bible” of modern psychiatry this weekend, the uproar over its many changes continues. “This is unprecedented, the amount of commentary and debate and criticism,” said Dr. Jeffrey Lieberman, president-elect of the American Psychiatric Association (APA).

People who opt for nonsmoking rooms in hotels with a partial smoking ban are not fully protected from harmful exposure to so-called “thirdhand” smoke, according to a new study.

Job stress increases the risk of heart disease, but living a healthy lifestyle can significantly reduce that risk, a new study says. Researchers examined data from more than 102,000 men and women, aged 17 to 70, in the United Kingdom, France, Belgium, Sweden and Finland. Their lifestyles were rated in one of three categories — healthy, moderately unhealthy or unhealthy — based on smoking, alcohol consumption, exercise/inactivity and obesity.

Magnesium may be as crucial to children’s bone health as calcium, according to a small, early study. While it’s known that magnesium is important for adults’ bone health, few studies have examined the nutrient’s role in children’s bones. This study found a significant association between magnesium intake and absorption, and bone density in children.

Pimples have long been the bane of teenage existence, but pediatricians say there is now enough evidence on effective treatments to put out the first guidelines on battling acne in children. There is a range of medications that can clear up even severe cases of acne, according to the American Academy of Pediatrics (AAP). Writing in the May issue of its journal Pediatrics, the group throws its support behind new guidelines from the American Acne and Rosacea Society that detail how to treat acne in children and teens of all ages.

A new Swedish study suggests that parents who want to protect their infants from developing allergies should try a simple approach to introducing their children to the wide world of microbes: Just pop their pacifiers into their own mouths before giving them back to their babies.

Abnormal brain wiring may explain why some people become so fixated on their appearance that their obsession makes it hard for them to function, a new study suggests. The study included people with body dysmorphic disorder, a mental illness that causes people to believe they are disfigured and ugly, even though they look normal.

Heart disease risk factors can lead to a decline in brain function in both younger and older adults, Dutch researchers report. The new study included nearly 3,800 people, aged 35 to 82, who were checked for heart disease risk factors such as smoking, diabetes and high levels of “bad” cholesterol, and given tests to assess their memory and mental skills such as the ability to plan and reason and to begin and switch tasks.

Why is it that at the first sign of stress or pain, we immediately reach for a bar of chocolate or make plans with friends for after-work drinks? Instead, we should be learning to read what our body is telling us. Our Move of the Week can help with these daily stresses.

Keeping the brain nimble in older adulthood may be as simple as playing a video game, according to researchers who compared the thought-process benefits of crossword puzzles with a computer program that increased users’ mental speed and agility. An expert not involved with the new study called it “interesting and exciting.”