Just be sensible to stick the general low carb guidelines and trim it to the way your body reacts to each food by testing before and 2 hours after with a meter as your guide. Remember every individual diabetic reacts differently to different foods nutritional information on packs is unreliable. Also be aware carb content can vary greatly between different brands or seemingly minor variations of the same grocery item .
The 7 day, 30 day and 90 day averages you can read from your meter are a pretty good guide to how well you are driving down your HbA1c. Since I have driven my HbA1c down I now have changed my test schedule to one week of fairly intensive testing per month + on any occasion my daily routine changes or special meals holidays ...........
This chart is part of the key