Hi
@KEB27 and welcome to the forum.
When I read that you controlled your Blood Glucose using diet and exercise, I assumed that you actually knew how to do so. It's very sad when people make the mistake of thinking that the government health advise applied equally to T2 diabetics because all you need is a Blood Glucose monitor in o9rder to see that it most definitely does not!
Exercise has less effect than what (and when) you eat, though it probably has more effect than does metformin alone.
All carbohydrates digest into glucose (both starches and sugars), so they affect your blood glucose. Medicines attempt to open up a valve to remove excess glucose, but dietary approaches limit the incoming amount of glucose by reducing the foods our bodies have trouble with. Exercise tries to use up the energy provided by the glucose - so only works at the edges unless taken to extremes and even then as soon as you have to stop you are n trouble again.
The main culprits for starches are bread/flour, potato, pasta, breakfast cereals, rice and other grains (whole as well as refined).
The main culprits for sugars are sugar, honey, foods/drinks with added sugar, tropical fruit, fruit juices.
Carbohydrates are the only non-essential macro-nutrient meaning our bodies can make more than we require from fats and proteins. Thus you can theoretically (but don't need to) live on zero carbohydrates. Some people eat 'carnivore ' style and so do almost eat zero carbs, but most of us eat rather more - just a fair bit less than the government health guidelines. Anything below 130gms of carbs per day is considered to be low carb, anything below 50gms per day is very low carb, and anything below 20gms per day is 'keto'.
We all have slightly different in how our bodies handle carbs (otherwise we wouldn't have this T2 problem), this varies between different foods (even with exactly the same theoretical carb content) and even can vary between different times of day. Breakfast is usually the time when we need to reduce carbs most because most of us are more sensitive to carbs in the morning. Unfortunately breakfast for most people is usually a very heavy carb meal with breakfast cereals, sugar, bread, tropical fruit or juice etc.
Low/no carb foods include eggs (great for breakfast), meat, fish, cheese (and full fat dairy - low fat has higher carbs), above ground veg, nuts, berries.