TheGreek, excellent question. I always wondered about that, then I found this article on Aging Care that explains that the brain controls everything within our system, so when the brain breaks down [Alzheimer's/Dementia] eventually the rest of the body will break down, too.
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https://www.agingcare.com/articles/if-alzheimer-s-is-a-disease-of-the-memory-how-do-people-die-from-it-133297.htm
When reading the article, you will notice advertisements under the paragraphs... scroll over them to read the rest of the article.