Insulin-sensitive Obesity: Lessons From Longitudinal Data

While obesity is a risk factor for metabolic disease, sub cohorts with obesity not complicated by the metabolic syndrome have been described. These so called "metabolically healthy obese" may have reduced risk of type 2 diabetes, cardiovascular disease and all-cause mortality compared with individuals with obesity who present with components of the metabolic syndrome.

Longitudinal studies with diabetes and cardiovascular disease risk endpoints reported that individuals with obesity who are metabolically healthy (MHO) held an intermediate health status, such that they were still worse off than the healthy normal-weight individuals. While there have been studies evaluating the stability of the MHO phenotype over time, no study has reported the durability of insulin-sensitivity per se, as measured by the gold-standard hyperinsulinaemic-euglycaemic clamp. In the present study, we aimed to trace the change in insulin resistance/sensitivity, and to uncover predictors of insulin resistance in older age. The secondary aims were to trace the change in body composition, fat distribution and metabolic markers over time in a well-phenotyped cohort studied approximately 5-6 years apart.

Inclusion criteria

• Participation in two previous studies conducted at the Garvan Institute of Medical Research Clinical Research Facility (described in the other publications 1-3).
• Willingness to give written informed consent and willingness to participate in the study.

Exclusion criteria

• Pregnant and/or lactating women.