Diabetes affects the whole endocrine system. Stress and anxiety increase the production of adrenaline and cortisol, which cause blood sugar levels to rise. T1 diabetics can compensate by injecting more insulin, but miscalculations can lead to hypos. I don't suppose TM is able to follow a rigid diet, which will almost certainly cause her problems.
I'm not sure that T1 diabetes does get worse with age, but the side effects certainly accumulate.
In any case, this is speculation. Whatever the reason for TM avoiding interviews and ducking direct question, it's not acceptable, especially for somebody who called the election in the first place and tried to appear "strong and stable".
When a political leader lies on their CV - can you trust them?
Farage fails to report 5 million gift!
Why doesn't Starmer hold another referendum?


Can you have 'severe' diabetes?