U.S. troops fighting in Iraq and Afghanistan are getting a record number of brain injuries.

USA Today reports the Pentagon released numbers from last year that show an average of 16 troops a day got a concussion, that's the highest pace for traumatic brain injuries of any period in 10 years of combat.

The majority of cases were mild concussions.

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A study by researchers at Brigham and Women's Hospital suggests people who get short, disrupted amounts of sleep have an increased risk of diabetes and obesity. The study examined 21 healthy people in a lab setting where researchers tweaked their sleep schedules.

Scientists reported disrupted sleep schedules altered insulin levels and sent three people into a prediabetic state.

Those who slept irregularly or had restricted sleep had a slower metabolic rate. If they endured such sleeping patterns for a whole year without changes in routine or diet, the study suggests a person could gain as much as 12 pounds.

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More unmarried couples living together are having children.

A new health survey found between 2006 and 2010 that 22 percent of couples having their first child together were not married, that's up from 12 percent in 2002.

Almost half the children born out of wedlock were to couples who living together, rather than single parents.

The CDC's National Center for Health Statistics conducted more than 22,000 interviews for its findings.

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Ophthalmologists say 40 is the age when people usually start complaining of changes in their vision, and it's also the time when early signs of eye disease can be detected.

Doctors say baseline eye exams at 40 are important for detecting presbyopia, glaucoma, macular degeneration and the early signs of cataracts. They also say know your risk factors for these diseases.

Smoking and diabetes raise your risk of eye problems.