- Obese group defined as BMI ≥95th percentile. These will further be subgrouped into those with normal and those with abnormal glucose tolerance normal glucose tolerance (NGT) defined as fasting glucose level<100mg/dl and a 2 hour postprandial glucose level<140mg/d and abnormal OGTT defined as fasting level ≥100mg/dl and/or 2hr ≥140 using a glucose load of 1.75 g/kg body weight (max 75 g).Hence, we will