Sports nutrition research shows that using chocolate before exercise can increase glycogen storage in muscles, which is beneficial to improve exercise ability, save glycogen consumption, delay fatigue and restore glycogen after long-term exercise. Therefore, for people who participate in sports or physical activities, children and adolescents in the growth and development stage, people who are weak and sick, and people who need energy supplement, chocolate is an ideal energy supplement and exercise promoter because of its high energy concentration density, small size, unique flavor, sweet but not greasy, and not easy to feel full.