Young couples volunteered to have their hearts and brains monitored and were then asked to melt dark chocolate in their mouths before kissing their partners.

The research was led by Dr David Lewis, formerly of the University of Sussex, and now of the Mind Lab. "These results really surprised and intrigued us," he said. "While we fully expected chocolate - especially dark chocolate - to increase heart rates due to the fact it contains some highly stimulating substances, both the length of the increase, together with the powerful effects it had on the mind, were something none of us had anticipated."
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