Sugar

Sugar is a chemical composite of hydrogen, carbon and oxygen atoms in chains often found in lifeforms, where they are utilized for energy release when broken down. Sugars from plant sources are often consumed by animals and humanoids of many races and cultures, as a required portion of their diet. Sugar can also represent a danger of over-consumption, which leads to energy-level imbalance and physical damage.

Humans and other species often consume sugary foods that are not considered a necessity of their diet, especially in the form of candy. Many civilizations also add sugar to sweeten products that are bitter in flavor, or even those that are simply bland. Tea and coffee beverages are often mixed with sugar to an individual's preference. 

While Klingons often rely on protein sources of food, such a the meat of prey, they also possess a high-metabolism which makes them rely on a relatively high sugar intake. Fruit juice is often consumed, and more refined tastes enjoy gel pastry of various recipes. Klingons enjoy food and drink which causes physical reactions, including sugary beverages such as the sweet coffee beverage raktajino, and strong juices like prune juice.