Hormones are so powerful that almost everything in the human body depends on the right kind of growth and levels. Hormones affect everything from blood sugar to blood pressure, the metabolism of the body, sleep quality, and even your mood. Your mood and emotions are controlled and depend on the hormones. These four hormones, i.e., dopamine, serotonin, endorphins, and oxytocin, are labeled as happy hormones. A decrease in their level results in anxiety and depression, two severe forms of mental illnesses. If these are not treated on time, they can lead to other severe illnesses.