Americans consume more than half their daily calories from ultra-processed food. A new study finds consuming lots of this food is linked to a higher risk of many diseases.

A diet composed of 80% ultra-processed foods led one British doctor to gain weight and feel unwell. Now he's trying to nail down the health effects of this type of diet, which many Americans eat.

Sure, they're tasty, but packaged snacks and meals can be packed with sugar, salt and a list of unpronounceable ingredients. So what are they doing to your health? Scientists are trying to find out.