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To ditch dessert, feed the brain

Date:
November 15, 2011
Source:
Yale University
Summary:
Brain imaging scans show that when glucose levels drop, an area of the brain known to regulate emotions and impulses loses the ability to dampen desire for high-calorie food.

Brain reward regions are activated when glucose levels drop below normal, (blue). In lean people, but not in the obese, the prefrontal cortex which is involved in decision making and regulating impulses are activated when glucose levels return to normal, (red).
Credit: Courtesy Kathleen Page

If the brain goes hungry, Twinkies look a lot better, a study led by researchers at Yale University and the University of Southern California has found.

Brain imaging scans show that when glucose levels drop, an area of the brain known to regulate emotions and impulses loses the ability to dampen desire for high-calorie food, according to the study published online September 19 in The Journal of Clinical Investigation.

"Our prefrontal cortex is a sucker for glucose," said Rajita Sinha, the Foundations Fund Professor of Psychiatry, and professor in the Department of Neurobiology and the Yale Child Study Center, one of the senior authors of the research.

The Yale team manipulated glucose levels intravenously and monitored changes in blood sugar levels while subjects were shown pictures of high-calorie food, low-calorie food and non-food as they underwent fMRI scans.

When glucose levels drop, an area of the brain called the hypothalamus senses the change. Other regions called the insula and striatum associated with reward are activated, inducing a desire to eat, the study found. The most pronounced reaction to reduced glucose levels was seen in the prefrontal cortex. When glucose is lowered, the prefrontal cortex seemed to lose its ability to put the brakes upon increasingly urgent signals to eat generated in the striatum. This weakened response was particularly striking in the obese when shown high-calorie foods.

"This response was quite specific and more dramatic in the presence of high-calorie foods," Sinha said.

"Our results suggest that obese individuals may have a limited ability to inhibit the impulsive drive to eat, especially when glucose levels drop below normal," commented Kathleen Page, assistant professor of medicine at the University of Southern California and one of the lead authors of the paper.

A similarly robust response to high-calorie food was also seen in the striatum, which became hyperactive when glucose was reduced. However, the levels of the stress hormone cortisol seemed to play a more significant role than glucose in activating the brain's reward centers, note the researchers. Sinha suggests that the stress associated with glucose drops may play a key role in activating the striatum.

"The key seems to be eating healthy foods that maintain glucose levels," Sinha said. "The brain needs its food."


Story Source:

The above story is based on materials provided by Yale University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Kathleen A. Page, Dongju Seo, Renata Belfort-DeAguiar, Cheryl Lacadie, James Dzuira, Sarita Naik, Suma Amarnath, R. Todd Constable, Robert S. Sherwin, Rajita Sinha. Circulating glucose levels modulate neural control of desire for high-calorie foods in humans. Journal of Clinical Investigation, 2011; DOI: 10.1172/JCI57873

Cite This Page:

Yale University. "To ditch dessert, feed the brain." ScienceDaily. ScienceDaily, 15 November 2011. <www.sciencedaily.com/releases/2011/09/110919121818.htm>.
Yale University. (2011, November 15). To ditch dessert, feed the brain. ScienceDaily. Retrieved April 20, 2014 from www.sciencedaily.com/releases/2011/09/110919121818.htm
Yale University. "To ditch dessert, feed the brain." ScienceDaily. www.sciencedaily.com/releases/2011/09/110919121818.htm (accessed April 20, 2014).

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