processed foods

Think sugary cereals, frozen pizzas, chips, soda and ice cream tied to high rates of obesity and other disease. Not all ultraprocessed foods are unhealthy, however.

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.

Obesity is hurting the nation's health, but the pain is not evenly spread. Those who have low incomes are the most dependent on processed foods sweetened…