Severe Alzheimer’s disease can cause problems with mobility, eating and breathing. These complications can significantly increase risk for pneumonia–the most commonly identified cause of death in end-stage Alzheimer’s patients.
Kalia, Madhu. Dysphagia and Aspiration Pneumonia in Patients with Alzheimer’s Disease. Metabolism. 2003; 52: 36-8. http://www.journals.elsevierhealth.com/periodicals/ymeta/article/PIIS0026049503003007/abstract