When ill, a person with diabetes will usually have higher blood sugar levels. This is the result of more counter regulatory hormone activitiy. It is important to continue medications for diabetes management, and to monitor blood glucose on sick days. Some people are advised by their doctor to increase medication. Try to follow one's usual diet but do not do exercise to lower blood sugar when sick.
Exercise can aggrevate high blood sugars caused by illness.
Diet and medication adjustments must be made. It is important to monitor blood sugar levels and eat smaller, more frequent meals during the first day or so after traveling. Be sure to pack enough personal supplies and medication for the trip, especially if traveling outside the country.