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Diabetes and fasting

What is fasting?

Fasting is when you choose not to eat or drink for a certain length of time. Sometimes, fasting needs to happen before surgery. You can also fast to help you lose weight or as a religious practice, like Ramadan. Sometimes, people who fast stop taking medicines too.

If you live with diabetes, you should talk to your GP about how to manage your health while fasting. A person with diabetes can get very sick if they change their normal routine without talking to their GP.
This factsheet will talk about fasting during Ramadan, but anyone who chooses to fast can use this information. If you choose to fast, your diabetes care team should respect your decision and help you to manage your diabetes.

What will my GP do to support me and my diabetes while fasting?

Seeing your GP is an important first step if you choose to fast. Your GP will talk to you about how you manage your diabetes. They will also talk to you about problems that may happen when you fast.

If you have issues with your diabetes, like kidney disease or eye problems, you are at high risk for complications. Your GP will talk to you about this. They will help you to prepare for the month of Ramadan.

Your GP will check your blood pressure, blood glucose (blood sugar) levels and lipids. They will talk to you about how to manage high or low blood sugar levels. They will also talk to you about any Ramadan-specific changes you should make to your normal routine.

You could become very sick if you don’t make changes to your normal routine during this time. There may be times when you need to break your fast to stay healthy.

  • Types of diabetic emergency

  • Hypoglycemia (low blood sugar)

    This is when your blood sugar goes too low.

    Symptoms include sweating, shakiness, confusion, blurred vision and loss of consciousness.

  • Hyperglycemia (high blood sugar)

    This is when your blood sugar goes too high.

    Symptoms include being very thirsty, frequent weeing, blurred vision and fatigue.

  • Diabetic Ketoacidosis (DKA)

    This is when your body doesn’t have enough insulin to convert glucose to energy.

    Symptoms include fast breathing, stomach pain, nausea and vomiting.

What will my GP do in the future if I have diabetes and choose to fast?

If you choose to fast for Ramadan, you should see your GP if you have any new symptoms. If you have a diabetic emergency, you should see your GP as soon as you can.

What can I do if I choose to fast while living with diabetes?

During Ramadan, your eating pattern will change. It is important to have good nutrition at this time. When breaking your fast, you should eat a small snack with around 15g of carbohydrates. This will give you a boost of energy before your main meal.

At your main meal, choose foods which will give you energy over a long time. These foods are called complex low GI carbohydrates. You should also eat lean meats, vegetables and salads. Drink plenty of water and when you do eat, chew your food well. You can do your normal physical activity. Avoid doing a lot of physical activity, especially during the few hours before your first meal.

It is important to continue to take your medicine and insulin. Your GP will let you know what to adjust your dosage to. Continue to check your blood sugar levels regularly. If you have any concerns, talk to your GP.

When should I call an ambulance?

If you are having a diabetic emergency call triple zero (000).

If you are unconscious, feel drowsy, can’t swallow or your symptoms don’t improve, you or your support person should call triple zero (000).

What questions could I ask my doctor?

  • What changes can I make to my diet?
  • What are the health risks of fasting for me?
  • When should I check my blood sugar levels?
  • How can I check my blood sugar levels?
  • What if I can’t control my blood sugar levels?
  • When should I see you again?

Support Services

Where can I learn more?

    General Information

  • Diabetes Australia

    Managing diabetes during Ramadan

  • National Diabetes Services Scheme (NDSS)

    Blood glucose monitoring

Important: This information is to be viewed by someone who has received a diagnosis from their doctor. It is not designed to be used to diagnose a condition or as a substitute for ongoing medical care.

Health Resource Directory factsheets are endorsed by South Western Sydney PHN’s Community Advisory Committee and local GPs
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