In Reply We wish to clarify that our study1 was not designed to look at nutritional status in Parkinson disease. The article that we cited by Paganoni et al2 on the association between body mass index and amyotrophic lateral sclerosis found a dose-dependent effect of body mass index on survival, rather than a threshold based on undernutrition as the letter suggests.2 We agree with Cardoso and colleagues that body mass index is not adequate to define the nutritional status of patients. We also agree that future research into the nutritional status of patients with Parkinson disease would be very valuable.
Wills A, Boyd J, Pérez A. Association Between Body Mass Index and Parkinson Disease—Reply. JAMA Neurol. 2016;73(7):892. doi:10.1001/jamaneurol.2016.1245