Impact of changes in obesity parameters on glucose metabolism and insulin resistance over a one-year period.
OBJECTIVE
Changes in indexes of obesity, such as waist circumference (WC) and body mass index (BMI), may influence some glucose metabolism-related parameters in both obese and non-obese subjects. We have investigated the impact of changes in WC and in BMI on data related to glucose metabolism over a one-year period.


METHODS
Data from 3213 individuals (2014 men, 1199 women) who underwent a general health screening two years running and were not taking antidiabetic medication were analyzed.


RESULTS
In men, percent changes in WC (%dWC) and BMI (%dBMI) were both significantly correlated with percent changes in fasting glucose (%dFG), in hemoglobin A(1C) (%dHbA(1C)), and in HOMA-IR (%dHOMA-IR). In women, these relationships were not significant except for the relationship between %dBMI and %dHOMA-IR. In a multivariate linear regression analysis using age, %dBMI, and %dWC as independent variables, %dBMI, but not %dWC, was found to be an independent predictor of %dHOMA-IR in both genders. Furthermore, in men, %dBMI was also an independent factor predicting %dFG and %dHbA(1C).


CONCLUSIONS
During the one-year period, a reduction in BMI, and thus weight loss, was found to be associated with the improvement of insulin sensitivity, especially in men. A reduction in WC was also associated with an improvement in insulin sensitivity in men; however, this relationship did not remain significant after controlling for changes in BMI.
Sakamoto
Aiko
A
Department of Cardiovascular Medicine, University of Tokyo Graduate School of Medicine, Tokyo, Japan. asakamoto-tky@umin.ac.jp
Ishizaka
Yuko
Y
Toda
Ei-Ichi
E
Nagai
Ryozo
R
Koike
Kazuhiko
K
Yamakado
Minoru
M
Ishizaka
Nobukazu
N
D015992:Body Mass Index; D005260:Female; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D007333:Insulin Resistance; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism*; D012737:Sex Factors; D055105:Waist Circumference
D005947:Glucose