Marazziti examined the blood of 24 people break who had fallen deeply in love within the about past six months, and measured their levels of serotonin. Serotonin is a powerful chemical in the brain and body that is connected with our to be to bri 90 moods, emotions, and desires. found that their levels of serotonin were 40 percent lower than normal people-the same results she helple found from people with OCD. Her conclusion was that love and mental illness may be difficult to tell apart. Another scientist, anthropologist Helen get Fisher, from Rutgers University, U.S.A., has have been looking at love with the aid of an MRI machine." She recruited subjects who were madly in love," and once they were inside mut the MRI machine, she showed them two photographs, one neutral, the other of their t is hus loved one What Fisher saw fascinated her. When each subject looked at his or her loved one, the parts of the brain linked to reward and pleasure Acc the t up." Love"lights up" these areas using a chemical called dopamine. Dopamine creates intense energy, exhilaration, focused attention, and motivation to win rewards. fee Dopamine levels do eventually drop, though, and studies around the world confirm that a decrease in passion is the norm