Abstract
Non-surgical weight loss induces a greater than expected decrease in energy expenditure, a phenomenon known as 'metabolic adaptation'. The effects of different bariatric surgery procedures on metabolic adaptation are not yet known and may partially contribute to weight loss success. We compared resting energy expenditure (REE) in 35 subjects (nine males; age = 46 ± 11years; BMI = 42.1 ± 6.5kg/m(2)) undergoing gastric band, sleeve gastrectomy or Roux-en-Y gastric bypass (RYGB) up to 2years after surgery. We found a greater than expected reduction of 130-300kcal/day at 6weeks after sleeve and bypass surgery which was not explained by changes in body composition; this change was not seen in the band group. The suppression in REE after sleeve and RYGB remained up to 2years, even after weight loss had plateaued. Our findings suggest that energy adaptation is not a contributing mechanism to medium-term weight maintenance after sleeve and RYGB bariatric surgeries.
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