Thu, Apr 01, 2010 - Page 14 News List

Chocolate comes out smelling of roses

The aroma of chocolate improves your mood, and lemon in your car can make you a better driver, says a new study

By Lucy Tobin  /  THE GUARDIAN , LONDON

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Just before you rip open your next chocolate bar and gobble it up, take a moment to have a good sniff of the unwrapped bounty. Just hold the chocolate up to your nose and breathe in its scent, because latest research suggests “odour du chocolat” improves your mood.

This happy news comes straight from the Human Olfaction Laboratory at Middlesex University, England, where Neil Martin, a reader in psychology, investigates the effects of room smells on human behavior. In his laboratory, Martin has a square box called an AromaCube, which heats up “odorants” contained in tiny glass bottles and then percolates the smell around the room. From that box, he discovered the power of chocolate in an experiment where he filled rooms with three smells, one of chocolate, a “malodor” of machine oil, which most people find unpleasant, and a lemony, pleasant-but-alerting odor, then monitored testers’ moods.

“The aim was to compare the effects of pleasant and unpleasant ambient odors on stress, anxiety, depression and mood,” Martin explains. “And whilst we’re still continuing the experiment, so far it seems that the smell of chocolate really does make people less stressed and anxious, and more relaxed.”

Chocoholics will also be pleased to hear about some of Martin’s earlier research. “In another study, we looked at the effect of chocolate on brain activity,” he says. “We presented people with a range of smells, some artificial food odors and some real food odors, with both samples including chocolate.” Martin used EEG (electroencephalography) technology to record his participants’ brain waves as they sniffed the air, and found that in both experiments, the chocolate smell consistently led to a reduction in a particular type of brain activity called theta, which is thought to be an index of attentiveness. “Theta levels dropped significantly across both indexes when testers smelled chocolate.”

The experiment also showed there’s no need for chocolate snobbery. “I know connoisseurs say posh chocolate, with a higher cocoa content, is better for your health, and it might be in some ways, but when it comes to the smell of chocolate and its resultant relaxing effect, we found it was the same however much milk the bar contains,” Martin says.

But some of his other scent findings provide more significant practical effects. “Scent can affect employment,” he says.

One study found that a combination of perfume and formal dress worn by applicants led interviewers to rate them as less warm and more manipulative. And Martin has shown that people perform less well on cognitive tasks and report more symptoms of ill health when smelling a “bad” smell.

As a result, Martin says people should be aware of their “olfactory environment” to control their feelings. “People can use scents to improve alertness, well-being and anxiety,” he says. “For example, another study showed that women in a dentist’s waiting room that had been scented with orange reported less anxiety than those in an unscented counterpart.”

A separate piece of research saw Martin and his team set up PlayStations loaded with Colin McRae’s Rally game, to test the impact of a lemony smell on driving ability. Martin invited men and women to play the game on three different levels and in three different environments, one in a room without any odor, one smelling of lemon, and one of machine oil.

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