Why we love chocolate?

Chocolate's ingredients have a significant impact on brain chemistry, it is a drug, too, with specific pharmacological action.

The sweet stuff contains cannabinoids, the compounds responsible for the high of marijuana. More significantly, chocolate contains caffeine and two substances, tyramine and tryptophan, that the brain converts into the feel-good chemicals dopamine and serotonin.

Chocolate stimulates the brain's pleasure centers, even opening the wrapper and looking at the contents starts your serotonin fibers firing.

However, too much chocolate causes a headache. That's probably due to the rush of serotonin.