heir work showed that romantic love causes a surge of activity in brain areas that are rich in dopamine, the brain's feelgood chemical. These included the caudate nucleus, part of the reward system, and an ancient brain area called the ventral tegmental area, or VTA. High levels of dopamine and a related hormone, norepinephrine, are released during attraction. These chemicals make us giddy, energetic, and euphoric, even leading to decreased appetite and insomnia – which means you actually can be so “in love” that you can't eat and can't sleep