The familiar pop that comes from opening a bottle of Yoo-hoo is one of deep nostalgia. The drink is refreshing and satisfying, but one thing is for sure: It’s not chocolate milk. So, what exactly is in a bottle of Yoo-hoo? Yoo-hoo was launched in the 1920s by Natale Olivieri, a New Jersey grocery store owner. Olivieri had already created a line of fruit juices called Tru-Fruit and felt a chocolate drink would also be appealing to his customers. Knowing that chocolate milk was a popular drink at the time, Olivieri wanted to create an alternative that would, unlike milk,...