I can only write from my experience of receiving the pre diabetic diagnosis.
I already have high blood pressure and when I had my yearly blood test 12 months ago I was told I had high cholestral and prediabetis, I was shocked to say the least.
I am an active person go to the gym and am in a walking group weighing 10 and a half stone at that time and normal weight for my height.
I went to have a chat with the diabetic nurse and asked for an appointment with a nutritionist at the hospital and was given advice, and I did lots of research. I found there is not a diabetic diet that suits all.
I was given a list of all the foods and drink I could eat and what foods to avoid, I bought a meter to check my blood sugar level and started checking what I could eat.
The restrictive diet lost me 1 and half stone in weight which I am not happy about and doc said to try and get back to 9 and a half stone but it's difficult.
My diet is
I avoid potatoes
white flour
white rice
parsnips
No cakes, ( well I allow myself one on special occasions)
I have red meat rarely
butter rarely
check labels
I cook my own soups and freeze
don't eat tinned food or take a ways
don't eat processed foods
Be careful with too much fruit this will increase your BS
as will some vegetables
Best to check after you have eaten, do a prick test.
I eat soya and linsead bread
steam all veg or roast in the oven with herbs
fish baked grilled or steamed
chicken roasted grilled or quick tried
eat brown rice cook a pan full and freeze in portions
Be careful with oils check the ones that are better for you
Get a list of Low to medium low G I foods
My BS level is now normal and my cholesterol is 4.3, doc says he would never have thought a patient could do this with diet alone but thing is if I can avoid the complication of diabetes I am going to do what I can.
It's difficult eating out. and going on holiday
Would you consider becoming a piscatarian for your health,something to think about..
Best of luck