Materials and Methods:
Non-obese and obese subjects with type 2 diabetes of either African origin living in Dar es Salaam, Tanzania (n=22) or Caucasian origin living in Malmo, Sweden (n=24) were studied by taking a fasting sample for analysis of insulin and leptin after an overnight fast. All subjects were treated with metformin alone or with sulfonylurea with or without addition of metformin.