Inclusion Criteria:  clinical diagnosis of FOIS-based disphagy or Smithard test (3 oz swallow test) (2 - 3) or previous FEES diagnosis classification of the functional oral intake scale (FOIS) level of disphagy in classes 4 or 5 (or levels 2-3 on specific clinical indication) Belonging to one of the territorial structures for the Management of Parkinson's Disease in the territory of Genoa  Exclusion Criteria:  Terminally ill subjects for pathology Subjects with severe disphagia and indication to artificial nutrition (enteral/parenteral) Severe renal, liver and respiratory failure Disphagy level classifications inconsistent with inclusion criteria