JerryRosen, that's horrific.
It is true that in the very final stages of Alzheimer's, people can lose control of the muscles that regulate swallowing.
However, there are a whole range of alternatives that can be used to ensure a person gets nutrition.
If the swallowing deficit is minor, the person can have thickened fluids and a soft diet, with help and supervision with feeding.
If more serious, a nasogastric tube (tube inserted via the nose and leading to stomach) or PEG feed (tube inserted directly into stomach) can be used to provide a liquid meal with fortified with all nutrients.
The only justification for withholding food would be if it was absolutely clear that your grandfather would die imminently. Then the above measures might be seen as causing unnecessary suffering, or prolonging it.
If your grandfather was not in that situation, I can't see any justification for allowing him to starve. Maybe you should speak to a lawyer?
Justice will be ours.
For informative articles, please see: www.elenacookblog.wordpress.com (my site www.elenacook.org was recently down due to google reporting it as hacked - hope to have it restored eventually)
www.spirodementia.wordpress.org (Spirochaetal Alzheimer's Association)
www.durayresearch.wordpress.org (Dr MacDonald's Duray research association)