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Changes in plasma lactate and muscle metabolism after Roux-en-Y gastric bypass (RYGB). (A) Relationship of lactate and glucose before surgery and 1 week and 3 months after RYGB [41]. (B) In vitro metabolism of glucose and fatty acids in muscle fiber strips from patients with obesity (data expressed as a percent of lean controls) [50,51]. Plasma lactate from non-diabetic individuals with obesity during an intravenous glucose tolerance test 42.
