MR Brain Scans of Healthy Women Reveal Fear of Getting Fat

That assessment changed when researchers utilized magnetic resonance imaging (MRI) technology to see what happened in the brain as these women viewed images of complete strangers.

If the stranger happened to be overweight and female, it surprisingly activated in women's brains an area that processes identity and self-reflection. Men did not show signs of any self-reflection in similar situations. "These women have no history of eating disorders and project an attitude that they don't care about body image,” said Dr. Mark Allen, a Brigham Young University (BYU; Provo, UT, USA) neuroscientist. "Yet under the surface is an anxiety about getting fat and the centrality of body image to self.”

Dr. Allen worked with graduate student Tyler Owens and BYU psychology professor Dr. Diane Spangler and published their findings in the May 2010 issue of the journal Personality and Individual Differences. Dr. Spangler and Dr. Allen collaborate on a long-term project to improve treatment of eating disorders by monitoring progress with brain imaging. When anorexic and bulimic women view an overweight stranger, the brain's self-reflection center--known as the medial prefrontal cortex--lights up in ways that suggest extreme unhappiness and in some cases, self-loathing.

The rationale for this new study was to establish a point of reference among a control group of women who scored in the healthy range on eating disorder diagnostic tests. Unexpectedly, even this control group revealed what Dr. Allen calls "subclinical” issues with body image. Seeing that, the investigators ran the experiments with a group of men for comparison. "Although these women's brain activity doesn't look like full-blown eating disorders, they are much closer to it than men are,” Dr. Allen stated.

Dr. Spangler noted that women are barraged with messages that perpetuate the thin ideal, and the bombardment changes how they view themselves. "Many women learn that bodily appearance and thinness constitute what is important about them, and their brain responding reflects that,” Spangler said. "I think it is an unfortunate and false idea to learn about oneself and does put one at greater risk for eating and mood disorders. It's like the plant in my office. It has the potential to grow in any direction, but actually only grows in the direction of the window--the direction that receives the most reinforcement.”

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