General statistical method
Data were analysed using mixed model longitudinal analysis of covariance for change scores adjusted for the baseline value [Thresholds for interpreting the magnitude of effect sizes (relative to clinical thresholds or the standardized difference/Glass's Baseline characteristics of the participants who completed the clinical trial (per protocol dataset).All values are raw mean (SD). BMI, body mass index; CON, non-protein isocaloric control; GCR, glucose clearance rate; KDPWHE, keratin-derived protein with whey; WHEY, whey protein isolate.