Oreos are one of the most well-known cookies in the world, with around 40 billion produced each year. But consumers might not know what some of the ingredients like soy lecithin and alkali-processed cocoa really do.

Food scientist Rosemary Trout analyzes each and every plant-based milk. From household staples like almond milk and oak milk to the lesser-known hazelnut and banana milk, watch as Rosemary explains not only where these milks are drunk, but how they're cul...