NASH Presence is Associated with a Lower Weight Loss One and 2 Years After Bariatric Surgery in Women with Severe Obesity

Given that obesity is a major medical problem associated with non-alcoholic fatty liver disease and the lack of studies on postsurgery weight loss according to hepatic histology, we aimed to analyse weight loss indicators according to non-alcoholic steatohepatitis (NASH) presence one and 2 years postsurgery. The weight loss pattern of 410 women with severe obesity (SO) was analysed after sleeve gastrectomy (SG, n = 191) and Roux-en-Y gastric bypass (RYGB, n = 219) according to NASH presence at baseline and at 12 and 24 months postsurgery. Weight loss indicators: expected BMI (eBMI), excess BMI loss percentage (%EBMIL), total weight loss percentage (%TWL) and alterable weight loss percentage (%AWL). Unlike RYGB, after SG, a higher percentage of NASH patients do not reach the eBMI 2 years postsurgery. %TWL and %AWL presented no differences after RYGB despite the presence of NASH. After SG, there is a worse ponderal evolution of all indicators analysed in the presence of NASH. Unlike SG, diabetic patients lose less weight than non-diabetic patients after RYGB. The presence of NASH in diabetics had no impact on weight loss indicators, but in non-diabetics, it had an impact, particularly in the SG group. The presence of NASH suggests a worse weight loss pattern through all the analysed indicators one and 2 years after SG in women. The presence of T2DM appears to result in less weight loss after RYGB, but only non-diabetic women presenting NASH lose less weight that non-diabetic women in the absence of NASH after SG.