i am not a diabetic. but i eat a diabetic diet. i have it strongly in my history and i was prediabetic.
just coz you have diabetes does not mean you have to become a vegetarian.
however there are ways of eating a vegetarian diet. first of all let me tell you only in the US is everyone concerned about protein. you get protein from just your veggies. my basic proten source is beans and lentils.
starch is your fuel. very low and very high blood sugar is really bad. you can die from either. the way your body processes starch and sugars is what makes it able to handle whole grains.
the BEST way to find out how you react to a food is actually testing your blood an hour, 1 1/2 and then 2 hours and see what happens. what affects one person does not another.
its not about all sugary foods are bad. its HOW your body processes it. in general some are bad for everyone. like sweet potato is better than white potato.
however becoming a vegetarian, and on top of that a diabetes diet - its really really REALLY hard. i really am a gluten free vegan. you will be surprised how tough it is to eat socially.
it CAN be done but its requires a lot of planning.
so to truly find out how your body handles sugar - buy a blood testing machine (the machine is cheap, but the sticks are expensive) and do a series of tests yoruself.
AND you will also find out how little you need to eat. how much we actually eat and how much we actually need are two different things. so portion size and how often you eat, many small meals instead of 3 huge meals make a big difference too.
for myeslf with my experiments i have found fat affects my blood sugar more than direct sugar itself. so i have cut fats from my diet drastically. it isnt easy i'd say.
my mom has diabetes and the one thing that affects her the most is exercise. if you take a 30 minute walk once a day, that's half the battle won.