Factors, complications and health-related quality of life associated with diabetes mellitus developed after midlife in men

Type 2 diabetes is increasing overall in the world and is mostly associated with Western lifestyle including replete, unhealthy diet, sedentary life style and growing obesity. In the future the highest prevalence will be seen among older people due to longer life expectancy and changes in demography. Because diabetes is associated with increased morbidity, especially from cardiovascular causes, and a shortened life expectancy, an important aspect in the older population is the impact of diabetes on health related quality of life (HRQoL) and development of disability. To measure HRQoL we have many valid instruments, one of them the widely used RAND-36 survey. The 2-hour glucose value is important in screening subjects at high risk for diabetes, but it is time consuming and costly. Recently, 1-hour post load glucose has aroused interest in the prediction of diabetes. Few studies have focused on the effect of the age of onset of diabetes and how it effects on the HRQoL at an older age. The aim of this study was to investigate the risk factors for future diabetes in men healthy in midlife; the interest was especially focused on 1-hour post load glucose. The other objective was to estimate the HRQoL in men who develop diabetes at an old age. The present prospective study is based on the Helsinki Businessmen Study originally consisting of 3.490 men, born in 1919–1934 and followed since the 1960 s. All the men had socioeconomically similar status and belonged to the highest social group. The extensive baseline examinations were conducted in 1974, when the men were in midlife, mean age 48. At that time the men s health, medication and cardiovascular risk factors were observed and self-related health (SRH) was rated on a five-step scale. The men who were healthy without medications were included in the follow-up group. The men were later investigated with postal questionnaires (1985/ 86, 2000, 2002/03, 2007). In 2000, at mean age of 73, the HRQoL of the survivors was examined using the RAND-36 instrument and was replicated in 2002/03, 2005 and 2007. Development of diabetes was evaluated using the National Drug Reimbursement register and self-reported diabetes in questionnaires. Baseline 1-hour post-load blood glucose and weight gain from the age of 25 to midlife predicted future diabetes, and especially a combination of 1-hour glucose >8.9 mmol/L and body mass index (BMI) of ≥30 was associated with a 10.1-fold increase of diabetes risk independently of cardiovascular risk factors. Men with late-onset of diabetes (age >75) tented to be healthier in midlife. Diabetes did not affect the HRQoL until after diabetes onset. According to the evaluation in 2000, three RAND-36 scales, i.e. physical functioning, general health and social functioning, worsened already after 0–4 years from diabetes onset but did not deteriorate thereafter. There was no consistent impact on mental health. In conclusion, this study demonstrates that in men, who develop diabetes later in old age, cardiovascular risk factors in midlife and elevated 1-hour post-load glucose and weight gain up to midlife are important predictors for future diabetes. Developing diabetes exerts clear effects on HRQoL, measured with RAND-36 very early after diagnosis, but affects only some of the domains.