Electronic-health Application To Measure Outcomes REmotely Clinical Trial

This is a single center, randomized, open-label, placebo controlled, parallel group study. The study treatment period is approximately 6 months and observation period is approximately 7 months. There are three parallel treatment groups: in-person nutritional counseling, nutritional counseling using an e-Health App, and standard care. Subjects will be randomly assigned in a 1:1:1 ratio using a computer-generated randomization scheme. Subjects in the two intervention arms will be given caloric recommendations designed to cause weight stability or modest weight gain, depending on their current BMI and weight loss history. All participants in the intervention arms will receive counseling either in-person or remotely through the App by registered dietitians (RD) working in the Bionutrition department of the Clinical Research Center at MGH. At MGH, approximately 150 ALS subjects (50 per treatment group) will be enrolled. Approximately 75-150 PD and HD subjects will enroll.