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The relation between body fat distribution and plasma leptin levels in the human was investigated in 51 obese and 41 non-obese subjects. Plasma levels of leptin showed a positive correlation with body mass index and subcutaneous fat area at the umbilicus level. However, a significant correlation between its plasma levels and visceral fat area was found in neither non-obese nor obese subjects. These results suggest that plasma leptin levels might be attributed mainly to the extent of subcutaneous adiposity in human obesity.