Other stimulants in chocolate include theobromine and methylxanthines. All of these stimulants increase the activity of neurotransmitters in the brain. Molecules of neurotransmitter cross the synaptic cleft and bind to receptors on the postsynaptic membrane. Whatever the true reason for chocolate's popularity, scientists will continue to investigate the sweet mysteries of cacao. In the meantime, grab a bar for yourself and a box for your Valentine.
Life is sweeter with chocolate.
The Science of Love - Research into why we love chocolate.