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Whole-body fat and lean tissue before and after gastric bypass surgery. (a) Percent body fat (closed circles) and lean (open squares) tissue and (b) fat (closed circles) and lean (open squares) tissue mass at baseline (time 0 months), and at 6 and 12 months after surgery. Values are mean ± s.d. *P < 0.0001, baseline vs. 6 months and 6 months vs. 12 months.
