Today's Top Medical News - January 5, 2018

A new report estimates more than 600,000 Americans will die of cancer this year. But overall the death rate has been going down for decades, dropping 26-percent since 1991. The American Cancer Society says the improvement is largely because of early detection and a decline in cigarette smoking. 

Exercise may be especially important when it comes to the elderly. A study in the Journal of Physiology says periods of inactivity have a greater impact on older people, leading to a loss of muscle mass and a change in how the nervous system controls muscle movements. 

More women than ever are either overweight or obese before getting pregnant. The Centers for Disease Control says in 2015, 45-percent of women were at a healthy pre-pregnancy weight. That's a drop of 5 percent since 2011. Being overweight increases the risk for a C-section delivery and for childhood obesity. 

(Meg Oliver, CBS News)

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