Lust drug?
While tryptophan could be considered 'chocolate's ecstasy', another chemical called phenylethylamine has earned the nickname 'chocolate amphetamine.' High levels of this neurotransmitter help promote feelings of attraction, excitement, giddiness and apprehension. Phenylethylamine works by stimulating the brain's pleasure centres and reaches peak levels during orgasm.

But many scientists are sceptical that chocolate could produce mood-altering effects in this way. Chemicals like tryptophan and phenylethylamine, which are also found in many other foodstuffs, are present in chocolate only in very small quantities.

Chocolate pot?
The same is true of anandamide, the current favourite candidate for a psychoactive chocolate ingredient. Anandamide is a neurotransmitter that targets the same brain structures as THC, the active ingredient in cannabis. But to make a substantial impact on the brain's own natural anandamide levels, experts estimate you would need to eat several kilos of chocolate!

Neuroscientist Daniele Piomelli suggests that chocolate works more indirectly to produce its 'high'. As well as anandamide itself, chocolate contains two chemicals known to slow the breakdown of anandamide. Chocolate might therefore work by prolonging the action of this natural stimulant in the brain.

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• Why Do Good? Brain Study Offers Clues
• Yanni - Within Attraction (live at the Acropolis)

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