This study was performed to investigate the change of bone mineral density(BMD) after 1 month Kirindiettherapy including very low calory diet(VLCD) in middle-aged obese women(65>age 40, BMI 25) under normal BMD(T-score 0) . ? ? ? We examined body weight, body fat, protein mass and BMD of 13 middle-aged obese women who visited to Kirin Oriental Hospital from Sep. 7. 2004 to Oct. 12. 2005 before and after 1 month Kirindiettherapy. Body weight, body fat and protein mass was checked by Inbody 4.0 and BMD was checked by quantitated computed tomography. Wilcoxon signed rank test was used for analyzing changes of body weight, body fat, protein mass and BMD before and after treatment. After 1 month treatment body weight(-4.89Kg, -6.74%, p=0.001), body fat(-3.47Kg, p=0.001) and protein mass(-0.97Kg, p=0.006) was significantly reduced. BMD was significantly increased in all cases(+4.87mg/cc,+4.16%,p=0.001). Though body weight, body fat and protein mass were significantly reduced, BMD was significantly increased(p<0.01). In this study, we can conclude that after 1 month Kirindiettherapy including VLCD, BMD in middle-aged obese women under normal BMD was significantly increased inspite of reduction of body weight, body fat and protein mass.