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There appears to be no difference in PYY secretion between nonobese and obese volunteers at baseline. At 1 year after surgery, RYGB, but not SG, is associated with increased postprandial secretion of PYY₁₋₃₆ and PYY₃₋₃₆ , which may account for long-term differences in efficacy and adverse effects between the two types of surgery.
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Kowalka et al. (2022) studied this question.
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