By Rick Nauert, Ph.D.
New research, published in the journal Biological Psychiatry, investigates the neurobiological mechanisms associated with the ability of individuals with anorexia (AN) to avoid food.
Investigators believe the knowledge of how anorexics are able to resist food may be applied to issues of obesity and over-eating.
In the study, Drs. Christina Wierenga, Walter Kaye, and colleagues discovered new insights on the brain mechanisms that may contribute to the disturbed eating patterns of anorexia.
Researchers examined reward responding in relation to metabolic state (hungry or satiated) in 23 women recovered from AN and 17 healthy women without eating disorder histories (e.g., the comparison group).
Women with active AN weren’t studied to reduce potential confounds related to starvation.
The healthy women, when in a state of hunger, showed increased activity in the part of the brain that motivates the seeking of reward, but the women recovered from AN did not. The recovered women also exhibited increased activation of cognitive control circuitry regardless of metabolic state.
Investigators found that women who have recovered from anorexia nervosa show two related patterns of changes in brain circuit function that may contribute to their capacity to sustain their avoidance of food.
First, hunger does not increase the engagement of reward and motivation circuits in the brain. This may protect people with anorexia from hunger-related urges. Second, they showed increased activation of executive ‘self-control’ circuits in the brain, perhaps making them more effective in resisting temptations.
“This study supports the idea that anorexia nervosa is a neurobiologically-based disorder. We’ve long been puzzled by the fact that individuals with AN can restrict food even when starved. Hunger is a motivating drive and makes rewards more enticing,” said Wierenga.
“These findings suggest that AN individuals, even after recovery, are less sensitive to reward and the motivational drive of hunger. In other words, hunger does not motivate them to eat.”
“This study offers new insights about the brain in AN, which we are using to guide treatment development efforts, and reduce stigma associated with this life-threatening disorder,” added Kaye, professor of psychiatry and director of the Eating Disorder Program at University of California, San Diego.
“Anorexia nervosa is a devastating illness and this study sheds new light on brain mechanisms that may enable people to starve themselves. In identifying these mechanisms, this work may provide circuit-based targets for therapeutics,” commented Dr. John Krystal, editor of Biological Psychiatry.
“But these same circuits and processes seem to be engaged ‘in reverse’ for obesity. Thus, this study may have broad implications for the country’s obesity epidemic as well.”