Vegetarian Reference: William Shakespeare Twelfth Night

William Shakespeare’s comment on the cause of Alzheimer’s in his play “Twelfth Night” “Methinks sometimes I have no more wit than a Christian or an ordinary man nas; but I am a great eater of beef, and, I believe, that does harm to my wit.”

How did they know when research would show such links regarding Amyloid Plaque and Alzheimer’s Disease for quite a long time later.

References:

Twelfth Night Kindle Edition

Wikipedia Amyloid