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HEALTH
Eating chocolate or drinking water can relieve aches and pains, a new study has shown.
Eating chocolate or drinking water can relieve aches and pains, a new study has shown.
A team of researchers says the distraction of eating or drinking for pleasure acts as a natural painkiller.
Although the findings come from studies on animals, the scientists believe the same effect takes place in people.
The study, published Wednesday in the Journal of Neuroscience by authors Peggy Mason, PhD, professor of neurobiology, and Hayley Foo, PhD, research associate professor of neurobiology at the University of Chicago, is the first to demonstrate that this powerful painkilling effect occurs while the animals are ingesting food or liquid even in the absence of appetite.
"It's a strong, strong effect, but it's not about hunger or appetite," Mason said.
"If you have all this food in front of you that's easily available to reach out and get, you're not going to stop eating, for basically almost any reason," the expert added.
In the experiments, rats were given either a chocolate chip to eat or had sugar water or regular water infused directly into their mouth. As the rat swallowed the chocolate or fluid, a light-bulb beneath the cage was switched on, providing a heat stimulus that normally caused the animal to lift its paw off the floor.
Mason and Foo found that rats were much slower to raise their paw while eating or drinking, compared to tests conducted while they were awake, but not eating.
Surprisingly, the researchers found no difference in the delayed paw-lift response between when the rat was eating chocolate and when it was drinking water, despite previous research indicating that only sugary substances were protective against pain.
"This really shows it has nothing to do with calories," Mason said. "Water has no calories, saccharine has no sugar, but both have the same effect as a chocolate chip. It's really shocking."
Mason and Foo then repeated the heat test as the rats were given quinine, a bitter drink that causes rats to make an expression called a gape that's akin to a child's expression of "yuck." During quinine administration, the rats reacted to heat as quickly as when not eating, suggesting that a non-pleasurable food or drink fails to trigger pain relief.
The context of ingesting was also important to whether eating or drinking blunted pain, the researchers found. When rats were made ill by a drug treatment, eating chocolate no longer delayed their response. However, drinking water still caused a reduced pain response, indicating that drinking water was considered a positive experience while ill.
By selectively inactivating a region in the brainstem called the raphe mangus - an area previously shown to blunt pain during sleep and urination - Mason and Foo were able to remove the effect of drinking water on the rat's pain response. The brainstem controls subconscious responses such as breathing and perspiration during exercise.
"You're essentially at the mercy of your brainstem, and the raphe magnus is part of that," Mason said. "It tells you, 'you're going to finish eating this, whether you like it or not,' just like you sweat while running whether you like it or not."
In the wild, Mason said, rats and other animals would not want to be distracted during the rare but important times that they were able to eat or drink. Therefore, the activation of the raphe magnus during eating or drinking would allow the rat to filter out distractions until their meal was completed. For obvious reasons, this natural pain relief would be activated when an animal is eating or drinking something pleasurable, but not when it tastes something that could be toxic or harmful.