Defren,I have already responded to you on this and would rather not set up some sort of pointless argument so this is the last time I will respond to this type of question.
I am not telling you that this is what you should do.
If I had been overweight on diagnosis (and it was recently), I think that like you I would have attempted the Newcastle diet There is no evidence of it's long term efficacy but at least I would have lost some weight and hence should have reduced insulin resistance.I would have followed the protocol as closely as possible, using shakes with a similar composition to those in the original trial.This was a very low calorie diet , the three daily shakes contained 60g carb , 42g protein and 9g of fat. This was low but not miniscule amounts of carbs. It was very low fat.I would have eaten the suggested vegetables. After the diet I would have followed the Newcastle teams recommendations ie a conventionally healthy diet with appropriate portions... after all if the diet had 'worked' then I would be able to tolerate a reasonable quantitiy of carbohydrates as indicated by 'passing' a glucose tolerance test.
If I were not overweight I would have adopted the strategy I did in fact use for 3 years, that of a low glycemic diet with a lot of exercise. This type of diet can come in a variety of colours. The GI diet as advocated by Jennie Brand Miller would for me include, eating 3 portions of low GI carb rich foods, 3 of protein rich foods and 2 of fat rich foods with 7 fruit and veg servings (25% protein,27% fat and 47% carbs) of which 60-90g would come from low GI starches. It is fairly low calorie because at my weight and age I don't actually need that much. This would be very similar to the type of diet advocated by the hospital here; it certainly works in terms of lack of complications. Daily exercise would (as it does) be an important management tool.
I could alternatively have adopted a diet like that I showed to you before, one that is actually higher in carbs, very low in fat and one where most of the protein comes from a vegetable source. This type of diet is very high fibre and also very very low in GI Most of the starchy carbs in that sort of diet come from from lentils and other pulses.
Again I would have incorporated a lot of exercise
Whether either types of diets would result in as low an HbA1c as yours is impossible to say (there is one low GI dieter on here that has a very low GI for many years) however I would want to look at the larger picture and look for the balance between what I consider to be a healthy pattern of eating and a satisfactory HbA1c (been there at 4.9% but and am quite happy with a slightly higher level). I think that one has to consider things holistically.
Personally, I wouldn't adopt a diet where in order to eat sufficient calories I had to add large quantities of fat. I see this rather like adding large quantities of unnecessary sugar, I also think that this type of diet does nothing to increase carbohydrate tolerance, how often do we read I couldn't eat even a tiny bit of that? I am not anti fat but I believe in selecting the amount and type carefully . I would also not attempt to replicate high GI carb foods like cakes, pastries etc with lots of highly processed ingredients. I believe very strongly that there is a lot of evidence that the healthiest diets are those that involve eating real food, mostly (but not exclusively) plants and not too much food of any sort.
But this is what I would do, and partly what I did do. I am not telling you to do this. Your mileage may indeed vary.
Finally, which is why I like to point out alternatives, I don't like to see facts turned on their heads . Blaming carbohydrates, from whatever source, for the incidence of obesity, calling them poison or suggesting that they are killers ( along with some really mangled science) is crazy. It's a bit like focussing on the wrong end of the telescope and thinking that what you see is the whole picture. There are many societies where very high percentages of the diet came or comes from carbohydrates of one sort or another (whether from rice, sweet potates maize or wheat) and where there were/are low levels of obesity and CVD. Some of these same societies have developed incredibly high obesity, disease rates as they have changed their lifestyles and incorporated modern processed foods into their diets.