Body weight and dysautonomia in early Parkinson's disease

Objectives Patients with Parkinson's disease (PD) begin to lose weight several years before diagnosis, which suggests weight variation is associated with some factor(s) that precede the onset of motor symptoms. This study aimed to investigate the association of autonomic nervous system with body weight in patients with PD. Materials and methods The subjects were 90 patients with early de novo PD. We examined the associations of body mass index (BMI) with sympathetic nervous activity reflected in orthostatic intolerance or cardiac uptake of 123I‐metaiodobenzylguanidine and parasympathetic nervous activity reflected in constipation or heart rate variability (HRV). Results Twelve patients (13.3%) were overweight (BMI>25 kg/m2), 62 patients (68.9%) were normal‐weight (18.5≦BMI