DIET LIBERALISATION IN OLDER AUSTRALIANS DECREASES FRAILTY WITHOUT INCREASING THE RISK OF DEVELOPING CHRONIC DISEASE
Background:Successful ageing relies on the prevention of frailty and chronic disease, many of whichhave a strong link with diet. Despite evidence suggesting diet is important in the management of frailty, there islittle evidence investigating the impact of a liberal diet on the prevention of frailty and development of chronicdiseases in the elderly. Objectives:To determine the impact of a liberal diet on the development of frailty andwhether this affects the incidence of obesity, diabetes, hypertension and hyperlipidaemia. Design:Secondary dataanalysis of the Australian Longitudinal Study of Ageing, 1992 to 2000. Setting:Random selection of older adultsfrom the South Australian electoral roll. Participants:1298 older Australians (629 women, 669 men), mean age77 years. Measurements:A validated food frequency questionnaire was used to measure the dietary exposure;liberal diet defined as: energy >10% estimated requirements; sodium >1600mg; total fat >35% energy; saturatedfat >10%; refined sugar >10%; fibre <38g males and <28g females. Frailty was determined using the Friedphenotype in combination with Cesari’s biological definition of frailty. Chronic disease outcomes were measuredby medication usage and obesity defined as BMI >30kg/m². Binary logistic regression was performed usingparticipants free of chronic disease at baseline to determine the impact of each dietary exposure independently,and combined, on the development of frailty and the incidence of chronic disease over the subsequent eight years.Results:Incidence of frailty after 8 years of follow up was 14%. The incidence of diabetes after 8 years of followup was 5.3%, hypertension 39%, hyperlipidaemia 15% and obesity 6%. A liberal energy intake adjusted for ageand sex, significantly reduced the risk of developing frailty eight years post baseline (OR 0.48, 95% CI 0.30,0.77). After adjustment for age, sex and body weight, a liberal saturated fat intake (>10% of energy) increasedthe risk of hyperlipidaemia (OR 2.11, 95% CI 1.27, 3.54). A liberal intake of sodium, total fat, refined sugar andfibre did not increase the risk of diabetes, hypertension, hyperlipidaemia or obesity. Conclusions:This studysuggests that a liberal intake of energy may decrease the risk of developing frailty in the elderly withoutincreasing the risk of developing obesity, diabetes, hypertension or hyperlipidaemia. Caution should remainhowever in the prescription of diets high in saturated fat as the link established with hyperlipidaemia in youngadults appears to be consistent in the elderly. Further research is required to explore the optimal sources of energyfor a liberalised diet and the effect of a liberalised diet on other diet related health conditions.