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A 32-Year Prospective Study of Change in Body Weight and Incident Dementia
The Honolulu-Asia Aging Study
Robert Stewart, MD;
Kamal Masaki, MD;
Qian-Li Xue, PhD;
Rita Peila, MSc;
Helen Petrovitch, MD;
Lon R. White, MD;
Lenore J. Launer, PhD
Arch Neurol. 2005;62:55-60.
Background The course of weight loss associated with dementia is unclear, particularly prior to and around the onset of the clinical syndrome.
Objective To compare the natural history of weight change from mid to late life in men with and without dementia in late life.
Design and Setting The Honolulu-Asia Aging Study, a 32-year, prospective, population-based study of Japanese American men who had been weighed on 6 occasions between 1965 and 1999 and who had been screened for dementia 3 times between 1991 and 1999.
Participants Of 1890 men (aged 77-98 years), 112 with incident dementia were compared with 1778 without dementia at the sixth examination (1997-1999).
Main Outcome Measure Weight change up to and including the sixth examination was treated as the dependent variable and estimated using a repeated measures analysis.
Results Groups with and without dementia did not differ with respect to baseline weight or change in weight from mid to late life (first 26 years’ follow-up). In the late-life examinations (final 6 years), mean age- and education-adjusted weight loss was –0.22 kg/y (95% confidence intervals, –0.26 to –0.18) in participants without dementia. Men with incident dementia at the same examination had an additional yearly weight loss of –0.36 kg (95% confidence interval, –0.53 to –0.19). This was not changed substantially with adjustment for risk factors for vascular disease or functional impairment and was significant for both Alzheimer disease and vascular dementia subtypes.
Conclusions Dementia-associated weight loss begins before the onset of the clinical syndrome and accelerates by the time of diagnosis. The potential impact on prognosis should be considered in the case of elderly persons at risk for dementia.
Author Affiliations: Institute of Psychiatry, London, United Kingdom (Dr Stewart); Pacific Health Research Institute, Honolulu, Hawaii (Drs Masaki, Petrovitch, and White); Johns Hopkins Center on Aging and Health, Baltimore, Md (Dr Xue); and Laboratory of Epidemiology, Demography, and Biometry, National Institute on Aging, National Institutes of Health, Bethesda, Md (Ms Peila and Dr Launer).
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