What ingredient differentiates energy drink smoothies from energy drink slushies?

The ingredient that differentiates energy drink smoothies from energy drink slushies is fruit smoothie mix. Smoothies typically incorporate fruit puree or smoothie mixes, which provide a rich, creamy texture and natural flavors that enhance the drink. This ingredient is essential in creating the fulfilling experience of a smoothie, making it distinct from a slushie, which generally consists of flavored ice and does not contain a creamy or pureed component.

While ice is a common ingredient in both drinks, it does not define the key difference since both variations can utilize ice for texture and chill. Flavoring can also be present in both smoothies and slushies, further blurring the lines between the two. Sugar is often used in both types of drinks as well but does not serve as the defining characteristic. The presence of fruit smoothie mix results in a smoother, more substantial and nutritious drink, which is what sets energy drink smoothies apart.