Couples in their 20s had their heart rates and brains monitored whilst they first melted chocolate in their mouths and then kissed.
Chocolate caused a more intense and longer lasting “buzz” than kissing, and doubled volunteers’ heart rates.
The research was carried out by Dr David Lewis, formerly of the University of Sussex, and now of the Mind Lab.
Experts, concerned at growing levels of obesity throughout the developed world, warn that chocolate should only be consumed in moderation.
Dr Lewis said: “There is no doubt that chocolate beats kissing hands down when it comes to providing a long-lasting body and brain buzz.
“A buzz that, in many cases, lasted four times as long as the most passionate kiss.”
He said substances in chocolate were already known to have a psychoactive effect, but that allowing it to melt on your tongue could be the secret to maximising the buzz.
The volunteers, all aged in their 20s, had electrodes attached to their scalps and wore heart monitors during the two tests.
The researchers compared their resting heart rates with those during the chocolate and kissing tests.
Longer lasting effects
Although kissing set the heart pounding, the effect did not last as long as that seen with the chocolate, which increased heart rates from a resting rate of about 60 beats per minute to 140.