Serological levels of brain‐derived neurotrophic factor (BDNF), a neuroprotective member of the trophin family, have been linked to PD.24, 25 With this in mind, we correlated the significantly different metabolites in this study to serological BDNF levels in our cohort, identifying a significant correlations (Pearson's correlation ranges r = 0.33‐0.39) between increased metabolites of FAO and increasing BDNF (Table 1). Here, BDNF is linked to Parkinson disease.