Abstract
OBJECTIVE: The aim of the present study was to examine the association between nutritional status and the incidence of disability regarding instrumental activities of daily living (IADL) among older adults. DESIGN: The study is part of the longitudinal SABE (Saúde, Bem-Estar e Envelhecimento; Health, Wellbeing and Ageing) Study that began in 2000 (first wave) with a multistage, clustered, probabilistic sample (n 2143) of older adults (≥60 years). The second wave was carried out in 2006, when 1115 elders were re-interviewed. The dependent variable was the occurrence of disability in 2006 (report of difficulty on ≥1 IADL). Nutritional status (measured at baseline) was classified on the basis of BMI: ≤23·0 kg/m2 (underweight); >23·0 and <28·0 kg/m2 (ideal range - reference); ≥28·0 and <30·0 kg/m2 (overweight); and ≥30·0 kg/m2 (obesity). SETTING: São Paulo, Brazil. SUBJECTS: One thousand and thirty-four individuals without difficulties regarding IADL in 2000 were selected, 611 of whom were re-interviewed in 2006. RESULTS: In the multiple logistic regression analysis adjusted for baseline variables (gender, age, number of chronic diseases, stroke, osteoarthritis and cognitive status), underweight (OR = 2·03; P = 0·034) and obesity (OR = 1·79; P = 0·022) remained associated with disability. CONCLUSIONS: Both underweight and obesity are associated with an increased risk of developing disability regarding IADL among older adults, in an independent fashion of other risk factors. Thus, adequate nutritional status is a key point to consider in the establishment of preventive measures.