Take the sugar-free cookies you mentioned. No sugar is added in the processing process, of course, it can be eaten moderately. But cereal will produce starch, and after eating it, it will still synthesize sugar, so don't eat too much. This rule also applies to other cereal foods. Although sugar is not used in processing, starch food will synthesize sugar during digestion.
In addition, the emotional adjustment of diabetic patients is also very important. A few years ago, some old people in my family got diabetes. At first, they strictly followed the old rules and dared not eat anything. They also eat with their families, which makes people live an isolated life every day and feel very negative. Later, after everyone understood the common sense of diabetes care, they did ideological work for the elderly and ate some fruits and vegetables, so that everyone didn't look separated, and the elderly were not as unsociable as the patients, and their health has been very good until now. It seems that apart from the matters needing attention, mental and psychological adjustment and family care are more important.