The association between baseline body mass index ( BMI < 25 kg/m ( 2 ) normal weight ; 25-29 .9 kg/m ( 2 ) overweight ; and 30 kg/m ( 2 ) obese ) and risk of high-grade ( Gleason 7 ) or low-grade prostate cancer ( Gleason < 7 ) versus no prostate cancer was examined using multinomial logistic regression .