Both Uses

diabetes
in
Flags of Our Fathers
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"Daddy's sick" soon yielded to "Daddy's gone," as Duke succumbed to diabetes at the age of thirty-five.†
Chpt 2. *

diabetes = a disease where the body cannot properly regulate blood sugar levels
Because of his age, sixty-two, and serious diabetes, it took the personal intervention of President Roosevelt to get the old warrior Howlin' Mad Smith out to battle.†
Chpt 6.

Definitions:

(1) (diabetes)
a long-term disease in which the body has trouble controlling blood sugar because it either doesn’t make enough of the hormone insulin or can’t use it properly

Type 1 diabetes happens when the body stops making insulin; people must take insulin every day and it often begins in childhood. Type 2 diabetes happens when the body still makes insulin but doesn’t use it well; it is often linked to extra weight and inactivity.
(2) (meaning too rare to warrant focus)