My lunch today was a huge salad - one third of a bag of prepared salad, a tomato, coleslaw, radishes, grated cheese boiled eggs, olive oil and vinegar dressing, and then coffee with cream once I had let it settle for a while. That was all I could eat - but it was about 15 gm of carbs. The eggs and cheese could have been substituted with any meat or fish.
It is a pretty standard lunch for me and I judge what I eat for dinner from my blood glucose reading once the protein part of dinner is done, so I know what to put with it or to have some dessert or not. These days I can see readings under 5mmol/l but I have not reduced my carbs, just stuck to low carb foods which shortly after diagnosis kept me around 8mmol/l after eating. The numbers went down as my metabolism recovered. I do eat a bit more of the same type of foods now, as I seem able to cope with them. It has been very easy - no need for any punishing exercise or fasting - which would have increased by blood glucose from what I found after a few small trials.