I believe the confusing dietary advice from all those different sources can apply to each and every one of us. Each of us has tastes different form every body else.
We all need different types of foods to make sure we are as healthy as can be.
Limiting yourself to a lot of foods means you are depriving yourself of experiences to your palette.
However, a lot of people have different tolerances to certain types of foods and those who have metabolic conditions including diabetes, can only tolerate, foods that are lower in carbs and sugars. The essential dietary advice is to find out how you personally cope with lowering your carb levels.
It is recommended on this site to reduce your carbs and sugars intake, reduce your plate size, increase your natural fat levels and exercise more if you can.
It has to suit you.
In my experience, for a typical T2 diabetic, just the simple adjustment in your lifestyle, will help tremendously.
Others have to be more extreme in their approach. There are certain metabolic conditions than have as well as high blood glucose levels but also high insulin levels and insulin resistance. When these people discover that the amount of carbs is reduced greatly there insulin resistance and their excess insulin is curtailed, which leads to lower blood glucose levels.
For some like me, carbs are carbs, regardless of label! I cannot tolerate grains or starchy vegetables, even small amounts of fruit will make me spike.
The nearer to normal blood levels they become, their health improves.
The more low carb higher fat approach is used, weight loss becomes achievable. This helps with health as well.
It is a personal choice and having the necessary knowledge of how to do it is essential. This is not widely used within the NHS.