There are no hard and fast rules. Your 6.2 is very good. Below 6.9 is pre-diabetes (borderline diabetes) levels for fasting Blood Sugar (BG). Recommendation is to be below 8.5 2 hours after a meal, but a lot of us like to get lower than that once we're settled in to our new diet and exercise regimes. I wouldn't bother with the fasting test personally at this stage - it only gives you a general idea as to how you're getting on, and is distorted by the "Dawn phenomenon", where your body releases sugar into your blood to prepare you for the day. I'd concentrate on post meal readings to analyse how different foods affect you, and what quantity of carbs you can eat at each meal and stay within limits. Check each meal time with different food types, cooked in different ways. For example, "old" potatos like maris piper BOILED leave me with very high BG, whereas roast I'm ok. The fat slows down the conversion to sugar in the blood. Mashed is even worse, as are jackets, as this releases the starched which do the damage. Boiled new pots are best for me. We're all different, so these are the things you need to find out rather than fasting levels at this stage. Later, you can see how the timing of evening meals, and types, do to your morning BG, (I can't eat within 2 hours of bed without wrecking my morning BG) but priority is working out normal foods first.