How do they know it has sugar just by looking at the food or the packaging?
Because most children aren't stupid and when something is called a "Fruit Loop" or the box displays pieces of cereal that resemble halloween candy they can make the connection to sugar.
the rainbow colored marshmallows tip them off.
Because most children aren't stupid and when something is called a "Fruit Loop" or the box displays pieces of cereal that resemble halloween candy they can make the connection to sugar.