Pleasure eating triggers body's reward system and may stimulate overeating

May 3, 2012

When eating is motivated by pleasure, rather than hunger, endogenous rewarding chemical signals are activated which can lead to overeating, according to a recent study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism (JCEM). The phenomenon ultimately affects body mass and may be a factor in the continuing rise of obesity.

"'Hedonic hunger' refers to the desire to for pleasure, and to enjoy the taste, rather than to restore the body's energy needs,"says Palmiero Monteleone, MD, of the University of Naples SUN in Italy and lead author of this study. "For example, desiring and eating a piece of cake even after a satiating meal is consumption driven by pleasure and not by energy deprivation. The physiological process underlying hedonic eating is not fully understood, but it is likely that endogenous substances regulating reward mechanisms like the hormone ghrelin and chemical compounds such as 2-arachidonoylglycerol (2-AG) are involved."

In this study, researchers assessed eight satiated healthy adults, aged 21󈞍 years, feeding them each their personal favorite food and, later, a less-palatable food of equal caloric and nutrient value. Researchers periodically measured 2-AG and ghrelin levels. The plasma levels of ghrelin and 2-AG increased during hedonic eating, with the favorite foods, but not with non-hedonic eating. This increase suggests an activation of the chemical reward system, which overrides the body's signal that enough has been eaten to restore energy.

"Hedonic may powerfully stimulate in an environment where highly palatable foods are omnipresent, and contribute to the surge in obesity,"says Monteleone. "Understanding the physiological mechanisms underlying this eating behaviour may shed some light on the obesity epidemic. Further research should confirm and extend our results to patients with obesity or with other eating disorders in order to better understand the phenomenon of hedonic eating."

The article, "Hedonic eating is associated with increased peripheral levels of ghrelin and the endocannabinoid 2-arachidonoyl-glycerol in healthy humans. A pilot study," appears in the June 2012 issue of JCEM.

Explore further: Ghrelin increases willingness to pay for food

Related Stories

Ghrelin increases willingness to pay for food

July 12, 2011

Research to be presented at the upcoming annual meeting of the Society for the Study of Ingestive Behavior (SSIB), the foremost society for research into all aspects of eating and drinking behavior, suggests that ghrelin, ...

Recommended for you

Formaldehyde damages proteins, not just DNA

September 29, 2016

The capacity of formaldehyde, a chemical frequently used in manufactured goods such as automotive parts and wood products, to damage DNA, interfere with cell replication and cause cancer inspired new federal regulations this ...

Synthetic 3D-printed material helps bones regrow

September 28, 2016

A cheap and easy to make synthetic bone material has been shown to stimulate new bone growth when implanted in the spines of rats and a monkey's skull, researchers said Wednesday.

Epigenetic clock predicts life expectancy

September 28, 2016

UCLA geneticist Steve Horvath led a team of 65 scientists in seven countries to record age-related changes to human DNA, calculate biological age and estimate a person's lifespan. A higher biological age—regardless of chronological ...

Engineered blood vessels grow in lambs

September 27, 2016

In a hopeful development for children born with congenital heart defects, scientists said Tuesday they had built artificial blood vessels which grew unaided when implanted into lambs, right into adulthood.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.