A glucose level of 13, especially if a fasting level sounds definitely diabetic. I am not sure how that would then drop to just 5,7 before lunch in a diabetic who is not on medication. Could it be that the 13 count was after rather than before breakfast. Even so I would probably consider it unacceptably high.
Have you seen these readings yourself or just been told about them by the uncle?
The uncle's behavior is not entirely rational/ sensible. He is obsessing about testing sugar levels but you state that he will help himself to cake etc, I,e the sort of food that will cause him to go high
One of the arguments put forward by doctors against issuing glucose meters to t2 diabetics is that testing may cause increases in anxiety. I would not normally agree with them but perhaps in someone with existing anxiety issues like your uncle they may have a point.
Perhaps his depression is the reason for his behavior.
First thing to do is to establish if he really is only prediabetic or if he is in fact already diabetic. His doctors will be able to carry blood tests to establish this.
Either way your uncle will need to take action to limit his glucose levels
- dietary changes, particularly reducing carbohydrate intake.
- increases to physical activity help
- as will loss of any excess weight, though you state that he is not overweight.
I would normally advise testing blood glucose levels early in the morning and before and after each meal to educate himself on how his body responds to varying types and quantities of foods.
I am not sure how helpful the above is but I wish you the best
Pavlos
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