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Bariatric surgery works for severely obese patients because it shrinks the size of the stomach. But years later, the stomach starts to expand and some patients regain the weight they lost.

People use wearable gadgets and phone apps to monitor their health — everything from calories consumed to medication taken. But all that data doesn't necessarily translate into better health care.

What's floating in the air that those bathroom air dryers are blasting onto your clean hands?

Parents who refuse to have their children vaccinated live near others who do the same, a study finds. That increases the risk that children will become infected, even if they've had their shots.

Mistakes are made. If the health insurance marketplaces screw up in calculating subsidies for consumers, it's the individual who is likely to be on the hook for repaying the excess.

An island off the coast of Tanzania has one of the world's highest addiction rates. But the majority of its people, who are Muslims, are uneasy with the 12-step recovery program's Christian concepts.

Your Stat correspondent treads lightly around a potentially heavy topic.

A 6-year-old can't be vaccinated against measles because he is recovering from leukemia. He faces a higher risk because parents at his California school have chosen not to vaccinate their kids.

Donations to the Global Alliance for Vaccines and Immunization hit $7.5 billion. The UK and the Bill and Melinda Gates Foundation were the most generous dollar-wise. Norway is the per capita champ.

Doctors and scientists could could learn a lot more about diseases if the were able to to tap into a wide spectrum of information about people who get sick and those who stay healthy.