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Table 1 Definitions of weight regain

From: Definitions of Long-Term Weight Regain and Their Associations with Clinical Outcomes

Definition Calculation
I. An increase of > 10 kg from nadir (Total body weight in kg at FU5 − Total body weight in kg at nadir) > 10 kg
II. An increase of > 25%EWL from nadir (EWL at nadir − EWL at FU5) > 25
III. An increase in BMI of 5 kg/m2 from nadir (BMI at FU5 − BMI at nadir) > 5
IV. Weight regain to a BMI > 35 kg/m2 after successful loss BMI > 35 at FU5 and successful loss to a BMI < 35. Successful loss was defined as EWL > 50 % at nadir
V. Any weight regain (Total body weight in kg at FU5 − Total body weight in kg at nadir) > 0
VI. An increase of > 15% of total body weight at nadir ((Total body weight in kg at FU5 − Total body weight in kg at nadir) / Total body weight at nadir in kg.) × 100 > 15
  1. %EWL percent excess weight loss, BMI body mass index, m meters, T2D type 2 diabetes, nadir lowest weight measured after surgery, FU follow-up