Sub-Study of the PREVIEW Study Australia

Inclusion Criteria: * Age 25 - 45 years and 55 - 70 years * Overweight or obesity status BMI\>25 kg/m2 * Pre-diabetes. The criteria from WHO/IDF (International Diabetes Foundation) for assessing pre-diabetes will be used as the formal inclusion criteria, i.e. having: Impaired Fasting Glucose (IFG): Fasting venous plasma glucose concentration 5.6 - 6.9 mmol/l or Impaired Glucose Tolerance (IGT): Venous Plasma glucose concentration of 7.8 - 11.0 mmol/l at 2 h after oral administration of 75 g glucose (oral glucose tolerance test, OGTT), with fasting plasma glucose less than 7.0 mmol/l. Due to potential between-lab variation (local assessments), HbA1c is not used as an inclusion criteria in the screening. * Informed consent required * Ethnic group - No restrictions * Smoking - Smoking is allowed, provided subjects have not recently (within 1 month) changed habits. However, smoking status is monitored throughout the study and used as a confounding variable. * Motivation - Motivation and willingness to be randomized to any of the groups and to do his/hers best to follow the given protocol * Other - Able to participate at CID's during normal working hours. Exclusion Criteria: Based on interview and/or questionnaire, individuals with the following problems will be excluded: * Medical conditions as known by the subjects: Diabetes mellitus (other than gestational diabetes mellitus); Significant cardiovascular disease including current angina; myocardial infarction or stroke within…