Hard agree which is why I followed some quite convoluted requirements in the countries I mentioned. China, however, did not come up with anything specific when I googled requirements following the posting by @mrsterryn. And Smart Traveller just has standard advice- dr letter, copy of script and original packaging. So not really sure how you’d verify requirements for China.
My diabetes experience is only during my chemo treatment - chemo/pred -induced diabetes. Apart from insulin I maintained a consistent BSL with diet. I started the day with porridge (no sugar) which sets you up for a mid-range reading (8-9). You can throw some raisins in whilst it is cooking. Now the weather is warming up porridge might not seem attractive. Instead throw oats and milk in a jar and leave in the fridge overnight. Eat cold in the morning for added benefit of fermentation overnight which is great for gut health. Baked beans are also great, add chilli / chorizo for more interest. Basically you need low GI foods and carbs so that BSL does not fluctuate wildly and no / little sugar. I guess that means no slushies @Denali .
Doctors letter won’t hurt, however just a copy of the prescription will suffice. You can double check with the relevant email address here
