If you have diabetes, traveling requires extra planning. Changes in meal patterns, activity levels, and time zones can affect your blood sugar levels. A little extra effort in advance can make your trip go smoother.
Before Your Trip
Tell your doctor about your plans. Ask for a letter explaining that you have diabetes and some extra prescriptions. Carry this with you at all times during your travel.
Ask your doctor about adjusting insulin doses if you're crossing time zones.
Get twice as many supplies as you think you'll need. If you need immunizations, plan to get them 3 to 4 weeks before your vacation. Be aware that some shots can affect your blood sugar levels. Talk to your doctor first.
Be prepared. Scope out health care centers where you're going.
Talk to the airline, hotel, or cruise ship about special meals.
Learn certain phrases in the local language such as "I need help" or "I have diabetes," "Where is the hospital," and "I need sugar."
Source : www.webmd.com/diabetes/traveling-with-diabetes
Here is also a diagram to show you the kinds of food that you may have in your diabetes
Can I use insulin abroad?
Using insulin abroad isn't usually an issue. However, it's useful to know what to do with your insulin to make sure it's in suitable condition for use.
If you're flying, you will require a doctor's letter to take insulin and/or syringes onboard your flight.
Patients should find out what types and strengths of insulin are available in the area in which they will be travelling, refer to the relevant pharmaceutical company.
Insulins used in the UK and many other countries are of the strength U-100. In some countries insulin may come as U-40 or U-80 strengths. These insulins are not interchangeable. Should they need to be used, the appropriate syringes are required.
Insulin should be kept out of direct sunlight and kept cool.
Insulin should never be allowed to freeze, therefore when travelling by air, insulin should always be carried in the hand luggage.
Insulin may be absorbed faster in warmer climates. Regular glucose monitoring is important, to allow any adjustments in dose to be made safely.
Source : www.diabetes.co.uk/travel.html