Summary

Original source:
http://www.washingtonpost.com/wp-dyn/content/article/2005/09/26/AR2005092600978.html

Details

• Study co-author Dr. David Bennett, director of the Rush Alzheimer's Disease Center, says the results raise the possibility that the disease attacks brain regions involved in regulating food intake and metabolism, as well as memory, and that weight loss is an early symptom.
• Weight loss frequently occurs after an Alzheimer's diagnosis and has been attributed partly to memory lapses or lifestyle changes associated with becoming infirm.
• Dr. Peter Rabins, an Alzheimer's researcher and professor of medicine at Johns Hopkins School of Medicine, said the research fits with an increasingly popular belief that Alzheimer's abnormalities "really are present for at least 10 years before there are any symptoms."
• "The idea that something would start before it became clinically obvious no longer seems that far-fetched," Rabins said.
• However, Rabins said he thinks it's likely that gradual weight loss stems from subtle behavior changes such as loss of initiative, which could result in less snacking or eating out, than in brain changes affecting metabolism.
• Those behavior changes, involving parts of the brain associated with Alzheimer's, often precede the diagnosis, but "because it's a subtle thing, it's often not recognized except in retrospect," Rabins said.
• Dallas Anderson of the dementias of aging branch at the National Institute on Aging, which funded the research, said the results are intriguing but that the theory needs further testing in a more diverse group.
• Those whose BMI dropped a point each year faced a 35 percent increased risk of being diagnosed with Alzheimer's later on, compared with those whose BMI remained stable.
• People tend to lose weight in old age because of loss of bone and muscle mass, but the researchers said factoring in age, chronic disease, gender and other characteristics that might have affected weight didn't change the results.

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