AIM: To analyze the national trends associated with body mass index(BMI) and living kidney donation.METHODS: Forty-seven thousand seven hundred and five adult living kidney donors as reported to the Organ Procurement and Transplantation Network from 1999 to 2011 were analyzed using their pre-donation BMI. Predictor variables of interest included age, gender, ethnicity, relationship, education status, and transplant region.RESULTS: Sixteen thousand nine hundred and seventyone of the living kidney donors were normal weight(35.6%); 19337 were overweight(40.5%); 9007 were mildly obese(18.9%); 1992 were moderate to morbidly obese(4.2%). Overweight and mildly obese kidney donors have increased through time by 12% and 20% every 5 years, respectively(P < 0.05). Donors 35-49years of age, hispanic males or females and black females, those with high school diploma or general Education Degree, and biologically related or partner/spouses were more likely to be obese.CONCLUSION: Over the past 13 years, the majority of living kidney donors have spanned the overweight to obese categories. Paralleling the national rise is an increase in overweight and mildly obese kidney donors. A fair number of moderate to morbidly obese living kidney donors are still allowed to donate. AIM: To analyze the national trends associated body mass index (BMI) and living kidney donation. METHODS: Forty-seven thousand seven hundred and five adult living kidney donors as reported to the Organ Procurement and Transplantation Network from 1999 to 2011 were analyzed using Their pre-donation BMI. Predictor variables of interest included age, gender, ethnicity, relationship, education status, and transplant region .RESULTS: Sixteen thousand nine hundred and seventyone of the living kidney donors were normal weight (35.6%); 19337 were overweight (40.5%); 9007 were mildly obese (18.9%); 1992 were moderate to morbidly obese (4.2%). Overweight and mildly obese kidney donors had increased through time by 12% and 20% every 5 years, respectively ) Donors 35-49 years of age, hispanic males or females and black females, those with high school diploma or general Education Degree, and biologically related or partner / spouses were more likely to be obese. CONCLUSION: Over the past 13 yea rs, the majority of living kidney donors have spanned the overweight to obese categories. Paralleling the national rise is an increase in overweight and mildly obese kidney donors. A fair number of moderate to morbidly obese living kidney donors are still allowed to donate.