It will depend upon your individual level of insulin resistance, most new insulin users are started on 1 unit for 10 carbs, and you then have to work out what works for you as an individaul and for what foods. I am pretty insulin resistant so have to use 1 unit for every 3 carbs, but I can get away with using less insulin if I have a lower carb meal, so counting carbs has become pretty much the norm. I have tried reducing the level of insulin, but BG readings then start to rise . I am also on Levermir so have to adjus the dosage according to my morning levels. I have been up as high as 40 units, but no lower than 25 units to maintain a good morning BG. You should be aware though that increasing insulin is a downward spiral as the more insulin you use the more weight you could gain which in turn leads to an increase in insulin dosage, but agin as I say it varies quite considerably between individuals, what works and happens to one may not to another.