The mean concentration of leptin was significantly decreased in all groups after the dietary intervention , but the mean changes in leptin level in the PLCD group was more prominent compared to the other two groups ( -@ , p < @ -LSB- PLCD -RSB- vs -@ , p = @ -LSB- RLCD -RSB- and -@ ng/mL , p = @ -LSB- PWLCD -RSB- ) .