Weight loss maintenance after bariatric surgery

Table 1 Definitions of weight regain after metabolic and bariatric surgery

Measurements, unit	Suggested definitions
EWL, %	> 25% EWL% regain from nadir[21,22]
Body weight, kg	≥ 10 kg weight regain from nadir[20,23,24]
	Any weight regains[25]
	Any weight regains after type 2 diabetes remission[26]
Body weight, %	≥ 10%[20], ≥ 15% TBW regain from nadir[20,27]
	≥ 10%[20,28], ≥ 20%[20,29], ≥ 25%[20,30] TBW regain from maximum weight loss
Body mass index	≥ 5 kg/m2 body mass index regain from nadir[31]
	Regain to a body mass index > 35 kg/m2 from nadir[32]

%EWL = [(pre-surgery weight - follow-up weight)/(pre-surgery weight - ideal weight)] × 100; maximum weight loss = preoperative weight - nadir weight; TBW: Total body weight.