Meanwhile, one of the few studies conducted in genetically stratified cohorts demonstrated lower caffeine concentrations and its metabolites among carriers of LRRK2 variants [28], which is notable given that LRRK2‐PD is typically characterized by a lower prevalence of RBD and reduced dementia rates compared with sporadic or GBA‐associated PD [29]. The gene discussed is LRRK2; the disease is Parkinson disease.