The initial level of you glucose suggests that you were quite close to the diabetic cut-off, and I am unsure as to what your second formal level was. Certainly if you are in the prediabetic range, you can decrease your chances of progressing to diabetes by following a normal low GI carb diet, with low fat and high fiber content. This coupled with exercise and weight loss will also help. Currently there is no evidence that a low carb diet is better than a normal carb diet, so you could use either. In answer to your other question, diabetes is driven by excess weight, and sweet things increase you risk by increasing your weight. I think you have done well with the weight loss, and would encourage you further, but do suggest doing a follow up test.
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