Hiya
Metformin doesn't actually work on your blood glucose Roy - neither does it increase however much insulin your pancreas is putting out. What it does is work in the inner recesses of your body to help reduce your resistance to the insulin etc. So it needs YOUR further input to help it work!
M takes around 3 weeks to 'ramp up' in your system do that your body gets max benefit of that dose. Every increase in dose can take the same length of time.
There are 3 things that 'work' for all types of diabetes - they are Diet, Exercise and Medication. Not everybody requires the latter, but every man Jack (or woman Jill!) of us, needs the first two.
Low GI carbs should certainly assist a Type 2, but that's not the end of it. In fact - it's ALL about carbohydrates. Each of us can only eat .... however much we can eat ..... without sending our blood glucose too high! - and that applies as much to us simple Type 1's as it does to T2's on whatever regime they are on. There is a myth that Type 1's can eat whatever they want whenever they want and just 'match' it with insulin. And like - I wouldn't be like the side of a house if I tried doing that except VERY occasionally? Well I did it once, and I was like the side of a very large detached house - put on nearly an extra 40% of my normal weight. Took me a lot longer to get it off again than it did to put on ......
You should test before and two hours after meals, to see what effect that amount of whatever you ate, has on your BG. And you know what? you may have to reduce the amount of whatever it is, no matter whether it's low GI, high GI or anything else.
What you are looking for is an increase of not more than 2.0 ish on your meter before and after. If it's 14 before breakfast, after brekkie you want it to be no more than 16.5 ish. etc. Don't worry for the moment that it's 14, as you carry on reducing or eliminating foods that skyrocket you, that 14 will also reduce. What I mean is eg 14 before , 20 after - Noooooooooo ! LOL
Here's some information on what you are aiming for at the moment from Diabetes UK
http://www.diabetes.org.uk/Guide-to-diabetes/Monitoring/Blood_glucose/Blood_glucose_targets/
As time goes on and you gain more control, you will probably be able to get below those figures.
Good luck !
