Methods	High risk groups identified from epidemiological surveys, opportunistic screening, volunteers. Randomisation by individual, stratified by sex, centre and OGTT result
Participants	Overweight or with family history of type 2 diabetes men and women aged 40-64 years with impaired glucose tolerance N=523
Interventions	Nutritionist delivered individual and group dietary advice. Weight goal established with physician and nutritionist and reguar assessment. Supervised exercise. Each person had 7 sessions in the first year and one session every 3 months subsequently
Outcomes	No clinical events outcomes. Development of diabetes, weight, diet, exercise, waist circumference, glucose, insulin, cholesterol, HDL, triglycerides, systolic and diastolic blood pressure. Follow up reported end of year 1
Notes	Study planned for 6 years, recruited 1993 to 1998. In March 2000 study stopped on basis of results regarding reduction in incidence in diabetes in treatment group