Public Health News Roundup: April 16
Study: More ‘Masculine’ and ‘Feminine’ Youth at Higher Risk for Cancer-risk Behaviors
The most “feminine” girls and the most “masculine” boys are also the most likely to engage in behaviors that pose cancer risks, according to a new study in the Journal of Adolescent Health. Researchers at the Harvard School of Public Health (HSPH) analyzed data on 9,354 adolescents in the ongoing Growing Up Today Study, finding that cancer-risk behaviors such as tobacco use, indoor tanning and physical inactivity were significantly more common in adolescents who more closely adhered to the traditional societal norms of masculinity and femininity. "Our findings indicate that socially constructed ideas of masculinity and femininity heavily influence teens' behaviors and put them at increased risk for cancer,” said lead author Andrea Roberts, research associate in the Department of Social and Behavioral Sciences at HSPH. “Though there is nothing inherently masculine about chewing tobacco, or inherently feminine about using a tanning booth, these industries have convinced some teens that these behaviors are a way to express their masculinity or femininity." Read more on cancer.
Study: Casual Marijuana Use Can Cause Dangerous Changes in Youths’ Brains
Casual marijuana use in young people can lead to potentially harmful changes in the brain, according to a new study in the Journal of Neuroscience. Researchers from Northwestern University's medical school, Massachusetts General Hospital and Harvard Medical School determined that casual marijuana smoking—defined as one to seven joints per week—could lead to changes to the nucleus accumbens and the nucleus amygdale, which help regulate emotion and motivation. "What we're seeing is changes in people who are 18 to 25 in core brain regions that you never, ever want to fool around with," said co-senior study author Hans Beiter, PhD, professor of psychiatry and behavioral sciences at Northwestern University, according to Reuters, adding, "Our hypothesis from this early work is that these changes may be an early sign of what later becomes amotivation, where people aren't focused on their goals.” Read more on substance abuse.
CDC: ‘Herd Immunity’ Helped Reduce H1N1 Flu Strain’s Impact This Season
While the H1N1 influenza strain was the predominant strain in the United States this past flu season, prior widespread exposure and its inclusion in the current flu vaccine meant it did not have nearly the impact it did in 2009, according to the U.S. Centers for Disease Control and Prevention (CDC). According to Michael Jhung, MD, a medical officer in the CDC’s influenza division, an overall “herd immunity” helped stop this season from turning into the worldwide pandemic seen in 2009. "This year, not only do we have a vaccine that works well, but millions of people have already been exposed to the H1N1 virus," he said, according to HealthDay. The flu strain also hit differently this season, peaking earlier, although once again younger adults were affected more than the elderly. Read more on the flu.