"The brains of obese people looked 16 years older than their healthy counterparts while [those of] overweight people looked 8 years older," said UCLA neuroscientist Paul Thompson, senior author of a study published online in Human Brain Mapping.
Much of the lost tissue was in the frontal and temporal lobe regions of the brain, the seat of decision-making and memory, among other things.
It is not clear whether weight gain caused a reduction in brain tissue, or if a smaller brain contributes to weight gain, or there are other factors contributing to both. http://health.usnews.com/articles/health/healthday/2009/08/25/as-waistlines-widen-brains-shrink.html -via Lifehacker
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