NEW YORK (CBS NEWS) – Getting out of your chair and moving around for 30 minutes reduces your risk of early death by as much as 35 percent. Researchers in New York analyzed 8,000 older and middle-aged adults’ movement data. It showed moderate to vigorous activity decreased early death by 35 percent, while less intense movement reduced the risk 17-percent. Another recent study found a quarter of adults sit more than 8 hours a day.
A small study of teenagers finds those who tried cannabis once or twice have more grey matter in their brains than those who didn’t try the drug. The biggest differences were in the areas of the brain involved in memory development, special abilities and fear. Researchers in Vermont say the effect of the increased grey matter is unclear. Previous studies show marijuana can have long-term harmful effects on the developing brain’s of teens.
And teenagers and middle-schoolers who reminisce about happy times are less likely to become depressed later in life. A British study of teens at risk for depression found those who recalled positive experiences had lower levels of the hormone cortisol, which can make people more susceptible to depression.
Those are some of the day’s top health stories. Meg Oliver, CBS News, New York.