The best response to her assertion would be , It is not uncommon for combat veterans to unexplainably develop such conditions like this
What is type 2 diabetes?
Type 2 diabetes is an impairment in way the body regulates and uses sugar (glucose) as a fuel.
The main difference between type 1 and type 2 diabetes is that type 1 diabetes is genetic condition that often shows up early in life, and type 2 is mainly lifestyle-related and develops over time
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