If you decide to go low carb, you need to increase protein (slightly) and fats, the good fats, so no margarines or vegetable oils which are full of transfats. You should use the healthy fats, eg butter, clarified butter/ghee, unrefined coconut oil, nuts, seeds, avocado, cheese, cream are all suitable for vegetarians.
Fat and protein keep you full for longer, I cant tell you how low carb you should be going, it depends on how much insulin resistance/pancreatic function you have, your activity levels, etc
In my first reply to you I sent you a couple of links, one of them is blood sugar 101, check it out you will learn about non-diabetic blood sugar levels, some people would give their eye teeth to have a fasting of 6.4, but if it was me I would freak, my fasting is no higher than 5. Having been seriously ill with diabetic complications I am now paranoid about blood glucose control.