Hi
@Lynntay and welcome to the forum. For years while my GP knew that I was prediabetic (though they didn't tell me) I was advised to eat porridge for breakfast and eat lots of fruit, veg, whole grains and to eat low fat.
I now understand how that pushed me into Type 2 Diabetes and also to slowly but surely gain an extra 1/5th of bodyweight, having been slim for all my life until then.
We have nearly all been misled: For those of us who are susceptible, eating lots of fruit and grains (even whole 'brown grains') push us into having higher blood glucose than is good for us. Also, it isn't the quantity of the food which is the problem, it's the type of food, so there is little point in counting calories or trying to cut down of food/ That just tends to make you hungry and miserable and is why most popular weight loss diets don't work for more than a few weeks - then the dieter runs out of 'will power'; understandably so, because they are trying to starve themselves!
I learned from my Blood Glucose meter that in my case and for the vast majority of others, eating fatty meat and fish, even cheese and cream (unless you are allergic to dairy) helps you keep slim, because body weight and blood glucose is ultimately determined by hormones - satiety hormones and insulin. So isn't it best to eat things which both increase satiety and don't raise your insulin by much?
Proteins and fats fill that bill almost perfectly while fruit have lotas of sugars, and the carbohydrates in veg like potatoes digest from starch into glucose very quicky indeed. Note the Glycaemic Index of mashed potato is higher than that of table sugar!
It took only a few weeks before my blood glucose response for my meals was 'normal', about 4 moths for me to lose that excess weight, and in less than a year I'd had 2 consecutive HbA1C results in the normal range - meaning I was technically in full remission form Type 2 Diabetes. Remission - not cure, since if I started eating all the low fat, high carbohydrate food my GP advised I'm sure I would be back with diabetes quite quicky, since that is what caused it in the first place!