Diabetes is a leading cause of morbidity, mortality and cost of illness^(1,2). Health behaviours, particularly those related to nutrition and physical activity, play a key role in the development of type 2 diabetes mellitus³. Whereas behaviour change programmes (also known as lifestyle interventions or similar) have been found efficacious in controlled clinical trials^(4,5), there remains controversy about whether targeting health behaviours at the individual level is an effective …