TF and Parkinson disease: In this study, we examine associations between nutritional status, phosphate, albumin, and transferrin together with cortisol levels, cognition (Mini‐Mental State Examination [MMSE] score), and motor function (Unified Parkinson′s Disease Rating Scale [UPDRS]‐part III scale) for patients with Parkinson's disease by Pearson′s correlations and with logistic regressions.