Your sugar which needs insulin for the treatment needs attention to something called insulin kinetics. This means you must eat and exercise physically matching to your insulin doses or vice-a-versa. The dietitian prescribed general diet might not be right for you as your insulin therapy
is basal bolus pattern. You might need diet precisely meant for your insulin doses where your intake of food is matched with insulin doses and then you'll not see any major fluctuations in the sugar levels. If your doctor has some diabetes
educator who can do this please ask them precisely for insulin- carbohydrate
matched diet or change your Diabeologist who can help you in this.
I hope you got an brief idea what you need to do. Take care.