Foundation, Rochester, MNKey Points 1. The body mass index is not an adequate measure of obesity in patients with cirrhosis. It is necessary to account for the contributions of ascites and fluid overload in addition to the distribution of adipose tissue. The interpretation of the literature on the effects of the body mass index on posttransplant outcomes is difficult if adjustments are not made for these factors. 2. Survival after liver transplantation has improved over the years and appears unaffected by obesity (even class III obesity) before transplantation. 3. Obesity is even more common after liver transplantation. Weight increases occur, with the greatest gains occurring within the first 6 months of transplant. Education and lifestyle management for the prevention of weight gain are the first measures in the posttransplant management of obesity. 4. Further investigation of bariatric surgery before, during, and after transplantation is needed. 5. Metabolic syndrome and its individual components are common after liver transplantation and are associated with increased risks of cardiovascular disease, cardiovascular death, liver-related deaths, and overall mortality. 6. Recurrent or de novo steatosis in the allograft is not uncommon and is a risk for steatohepatitis and progression to cirrhosis with graft loss. Liver Transpl 16:S65-S71, All aspects of liver transplantation (LT)-pretransplant, perioperative, and posttransplant-are affected by obesity and metabolic syndrome. Both obesity and metabolic syndrome are extremely prevalent in the general population and thus in transplant patients. Nonalcoholic fatty liver disease, a manifestation of metabolic syndrome, is an increasingly common indication for LT, but obesity is also commonly noted in many other patients with underlying chronic liver disease.This discussion concerns the clinical relevance of obesity and metabolic syndrome specifically with respect to LT and is not meant to be a thorough review of the literature.
OBESITYObesity is categorized according to the body mass index (BMI): overweight, BMI ¼ 25-29.9 kg/m 2 ; class I obesity, BMI ¼ 30-34.9 kg/m 2 ; class II obesity, BMI ¼ 35-39.9 kg/m 2 ; and class III obesity, BMI 40 kg/ m 2 . BMI, however, is not an accurate measure of true body fat versus lean muscle mass, for which waist circumference measures may better account. Central adipose tissue, typically manifesting as increased abdominal girth, is more metabolically active than peripheral adipose tissue and confers a greater risk factor for metabolic syndrome and cardiovascular disease (CVD). In our patient population (patients with end-stage cirrhosis), even waist circumference