Time Restricted Eating on Impaired Glucose Regulation(TRIG Trial)

Inclusion Criteria: 1. Aged ≥ 18 year 2. Diagnosis of impaired glucose regulation (i.e. FG between 5.7-6.9mmol/L) +/- impaired glucose tolerance (i.e. 2-hour postprandial PG between 7.8-11.1mmol/L) confirmed by latest OGTT results within 3 months prior to recruitment 3. Body mass index (BMI)of 23.0 to 45.0 kg/m2; Exclusion Criteria: 1. Confirmed diagnosis of DM or on hypoglycaemic treatment 2. Women who are pregnant or breast-feeding at recruitment 3. Patients taking glucocorticoid at recruitment 4. Active and uncontrolled thyroid diseases (including subjects on thyroid replacement therapy or anti-thyroid drugs) or active endocrine diseases such as Cushing's syndrome or Acromegaly at recruitment 5. Serious liver dysfunction or chronic kidney disease (AST or ALT \> 3 times the upper limit of normal, or eGFR\<30 ml/min/1.73 m2); 6. History of serious cardiovascular or cerebrovascular disease (angina, myocardial infarction or stroke) in the past 6 months; 7. Taking medications affecting weight or energy intake/energy expenditure in the last 6 months, including weight loss medications, antipsychotic drugs or other medications as determined by the study physician; 8. Currently participating in weight loss programs or weight change in the past 3 months (\> 5% current body weight) ; 9. Patients who cannot be followed for 24 months (due to a health situation or migration); 10. Patients who are unwilling or unable to give informed consent.