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How delicious meals affect your mood

Eating is one of the most multisensory of our activities; scientists have long claimed that much of what is perceived as flavor is actually filtered through the olfactory receptors, with taste buds playing a much smaller role.

Finnish researchers have revealed how eating stimulates brain’s endogenous opioid system to signal pleasure and satiety. The recent results obtained from Turku PET Centre have revealed that eating leads to widespread opioid release in the brain, likely signaling feelings of satiety and pleasure.

Eating a delicious pizza led to significant increase of pleasant feelings, whereas consumption of calorie-matched nutritional drink did not. However, both types of meals induced significant release of endogenous opioids in the brain.

Opioids are associated with pleasure and euphoria. The study revealed that a significant amount of endorphins is released in the entire brain after eating the pizza and, surprisingly, even more are released after the consumption of the tasteless nutritional drink. The magnitude of the opioid release was independent of the pleasure associated with eating. According to the researchers, it is likely that the endogenous opioid system regulates both feelings of pleasure and satiety.

Professor Lauri Nummenmaa from Turku PET Centre said “The opioid system regulates eating and appetite, and we have previously found that its dysfunctions are a hallmark of morbid obesity. The present results suggest that overeating may continuously over-stimulate the opioid system, thus directly contributing to development of obesity. These findings open new opportunities for treating overeating and the development of obesity”.

“It was a surprise that endorphins are released in the entire brain and that the nutritional drink had a larger impact. This creates a basis for future research and hopefully we will find ways to study and describe the development and predictors of addiction, obesity and eating disorders”, says Researcher, M.D., PhD. Jetro Tuulari.

The study was conducted using positron emission tomography (PET). The participants were injected with a radioactive compound binding to their brain’s opioid receptors. Radioactivity in the brain was measured three times with the PET camera: after a palatable meal (pizza), after a non-palatable meal (liquid meal) and after an overnight fast.

Another research has shown that the container used in serving food can also affect the taste a person gets, e.g. coffee tastes nearly twice as intense but only two-thirds as sweet when it is drunk from a white mug rather than a clear glass one. The next time you feel need the need for coffee, asked to be served in a mug.

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