Final answer:
The nurse should also advise the diabetic patient to stick to their normal diet, check their blood glucose levels regularly, and check their urine for ketones during illness.
Step-by-step explanation:
To the diabetic patient complaining of having a "flu bug," the nurse should also tell them to stick to their normal diet, as this will help maintain stable blood glucose levels. Additionally, the nurse should advise the patient to check their blood glucose every hour to monitor their levels more closely during illness. Finally, the nurse should instruct the patient to check their urine for ketones every 8 hours, as ketones in the urine can indicate a serious complication of diabetes called diabetic ketoacidosis.