A to Z Health Guide 2007

The scientific bulletin of the year may be the stem-cell breakthrough. But 2007 provided a whole alphabet of big medical news. TIME's A-to-Z guide reviews them

By Coco Masters, Alice Park, Carolyn Sayre, Tiffany Sharples, Alexandra Silver and Kate Stinchfield

Dementia

FRANK SITEMAN / GETTY
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There's little doubt that dementia wreaks havoc on the mind, but how does it affect the body? Women with dementia begin to lose weight at least a decade before the onset of the first cognitive symptoms, according to a recent study in Neurology. By the time of diagnosis, the sufferers were on average 12 lbs. (5.5 kg) lighter than their symptom-free counterparts. Experts theorize that weight loss may be an early sign of mental confusion, loss of motivation and impaired sense of smell, all of which may reduce a woman's desire to eat.

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