Why Travel Needs Extra Planning with T1D
Travelling with Type 1 Diabetes requires more preparation than most people realize. Changes in time zones, activity levels, meal timing, and access to supplies can all affect your glucose management. But with the right preparation, T1D should never stop you from exploring the world.
The 48-hour window before your trip is the perfect time to get organized. This gives you enough time to address any gaps without the last-minute stress that can throw off your glucose before you even leave.
Supplies: The Rule of Doubles
Always pack at least double the supplies you think you will need. Delays happen, trips get extended, and supplies can be lost or damaged.
Your supply checklist: - Insulin (rapid-acting and long-acting if applicable), double your expected usage - Syringes or pen needles, double quantity - Pump supplies if applicable (infusion sets, reservoirs, batteries) - CGM sensors and transmitter, bring extras - Blood glucose meter and test strips as backup to your CGM - Lancets and lancing device - Ketone strips (blood ketone meter preferred) - Fast-acting glucose (glucose tabs, juice boxes, candy) - Glucagon kit - Alcohol swabs - Sharps container or heavy-duty zip-lock bag for used needles
Split your supplies between your carry-on and a companion's bag. Never put insulin in checked luggage because the cargo hold can freeze and destroy it.
Documentation and Medical Letters
Get a letter from your doctor that states you have Type 1 Diabetes and lists all the medical supplies and devices you carry. This letter should be on official letterhead and ideally in English plus the language of your destination.
Airport security tips: - Insulin pumps and CGMs can go through standard metal detectors. Avoid full-body scanners and X-ray machines with your pump if the manufacturer advises against it. You can request a hand inspection instead. - Carry your insulin in its original pharmacy-labelled packaging when possible. - You are allowed to bring juice boxes and glucose supplies through security with a medical declaration. - Many airport security teams are familiar with diabetes supplies, but having your letter ready speeds things up.
Time Zone Adjustments
Crossing time zones can be tricky for insulin timing, especially with long-acting insulin.
Travelling east (shorter day): - Your day is shorter, so you may need slightly less basal insulin. - If you take long-acting insulin once daily, take your usual dose but be prepared to adjust the next day based on readings.
Travelling west (longer day): - Your day is longer, so you may need a small supplemental dose of rapid-acting insulin to cover the extra hours.
General tips: - Keep your watch on your home time zone until you land, then switch. - For pump users, change the pump clock to local time on arrival. - Test more frequently during travel days, every 3 to 4 hours at minimum. - Talk to your endocrinologist before your trip about a specific plan for adjusting your basal insulin across time zones.
Day-of Travel: Glucose Strategy
Travel days are unpredictable. Delayed flights, airport food, long drives, and stress all affect glucose.
Run a bit higher on purpose. Many diabetes educators recommend aiming for glucose between 8 and 12 mmol/L (144 to 216 mg/dL) during travel days. A mild high is far safer than a low at 35,000 feet or while driving.
Eat familiar foods when possible. Airport restaurants and gas stations can make carb counting difficult. Pack snacks you know the carb count for, such as granola bars, crackers, nuts, and fruit.
Stay hydrated. Flying is dehydrating, and dehydration raises glucose. Drink water regularly throughout your journey.
Set CGM alerts a bit wider for travel days to avoid alarm fatigue during an already stressful day. You can tighten them again once you are settled.
Wear medical identification. A medical ID bracelet or necklace ensures that if something happens, first responders know you have T1D. This is especially important when travelling alone.