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Targeting the brain to treat obesity
Date:7/23/2014

ing to full-blown cases of Alzheimer's disease show that the first signs of brain disease can occur at least 50 years prior to the emergence of serious cognitive dysfunction. These signs originate in the hippocampus, the area of the brain where memory, learning, decision making, behavior control and other cognitive functions come into play.

Still, most research on the role of the brain in obesity focuses on areas thought to be involved with hunger motivation (e.g., hypothalamus), taste (e.g., brain stem), reinforcement (e.g., striatum) and reward (e.g., nucleus accumbens) or with hormonal or metabolic disorders. This research has not yet been successful in generating therapies that are effective in treating or preventing obesity, Davidson says.

Vicious Cycle

Experiments in rats by Davidson and colleagues show that overconsumption of the Western diet can damage or change the blood-brain barrier, the tight network of blood vessels protecting the brain and substrates for cognition. Certain kinds of dementias are known to arise from the breakdown in these brain substrates.

"Breakdown in the blood-brain barrier is more rationale for treating obesity as a learning and memory disorder," Davidson said. "Treating obesity successfully may also reduce the incidence of dementias, because the deterioration in the brain is often produced by the same diets that promote obesity."

The "vicious cycle" model AU researchers put forth says eating a Western diet high in saturated fats, sugar and simple carbohydrates produces pathologies in brain structures and circuits, ultimately changing brain pathways and disrupting cognitive abilities.

It works like this: People become less able to resist temptation when they encounter environmental cues (e.g., food itself or the sight of McDonald's Golden Arches) that remind them of the pleasures of consumption. They then eat more of the same type of foods that produce the pathological changes in the brain, leading
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Contact: Rebecca Basu
basu@american.edu
202-885-5978
American University
Source:Eurekalert

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