There are many other active ingredients in chocolate as well as carbohydrates, proteins, vitamins, and minerals.
Other ingredients include
Histamine another neurotransmitter possibly responsible for the craving of chocolate and change in mood.
Magnesium and Potassium, which are essential for all living things, and are present in high quantities in chocolate
Thyphylline is a potent CNS and cardiovascular stimulant with dieretic and bronchial smooth muscle relaxant properties.