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.

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