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1.
diet: the food and beverage a person or animal consumes.

diagnose: to determine the root cause of (a disease).

dietgnose: to determine the root cause of a disease by the food and beverage a person or animal consumes.
"A person was 'dietgnosed' with obesity because of that person's junkfood consumption." - says a satirist
by Pseudonymthewild@gmail.com February 07, 2013