This page has information for people living with diabetes who are thinking about fasting for Ramadan. Ramadan in 2025 will run from on or around Friday 28 February for 29 or 30 days, ending with Eid al-Fitr, a religious holiday celebrated by Muslims worldwide. 

We have produced a factsheet about diabetes and Ramadan, which includes information about fasting and managing your diabetes during this time. This has been developed in partnership with the British Islamic Medical Association (BIMA). 

The Qur'an requires Muslims to fast during the month of Ramadan from sunrise to sunset. However, there are exceptions to this. One of them is that people who are ill or have medical conditions do not have to fast. This can include people living with diabetes.

Talk to your healthcare team about fasting

Before deciding to fast, it is important to check in with your healthcare team to see how you are currently managing your diabetes. This can help you to understand how fasting could be a risk to your health, how to reduce this risk or whether the risk to your health is too high. It is important to talk about your blood test results, any diabetes medications you are taking and existing diabetes complications or your risk of developing them.  

Take this opportunity to talk about what is or isn’t working well for you and your diabetes. If you find your diabetes is not quite on track before the fast, it would not be a safe option to fast this year.  

Knowing this can help you and your healthcare team make a plan on how to improve your diabetes and health over the next year. This can help you feel confident that you are working towards improving your health if you revisit the decision to fast the following year.  

Talk to your Imam about fasting

We would also suggest that you speak to an Imam to gain further advice about the alternatives to fasting if you are advised not to fast for health reasons. If you are an Imam and would like more information on advising people with diabetes during Ramadan, download our short guidance document (PDF, 65KB), which has been written in partnership with the British Islamic Medical Association.  

Failing to do so is in itself contrary to the Qur'an, which clearly states that you must not act in a way that harms your body (Al Baqarah Verse: 195). 

Exemption from fasting

People can be exempt from fasting if they: 

• are children (under the age of puberty) 
• are elderly 
• are sick or have a certain health condition 
• have learning difficulties 
• are travelling 
• are pregnant, breastfeeding or menstruating. 

Risks of fasting

It is important to discuss with your healthcare team how living with diabetes and following Ramadan could put your health at risk. Understanding your risk will depend on: 

• The type of diabetes you are living with. 
• If you are currently keeping your average blood sugar level (HbA1c) in a healthy range for you.
• The type of medication you use to manage your diabetes.
• If you take medications that put you at risk of low blood sugar (also called hypoglycaemia), such as sulphonylureas and insulin.
• If you're living with diabetes complications such as poor vision, nerve damage, heart or kidney disease. There is a high risk that fasting could make these health conditions worse.  

For example, people living with type 2 diabetes who manage with diet and lifestyle only, or who take one diabetes medication that does not increase their risk of hypoglycaemia will have a lower risk during the fast if they are already keeping their HbA1c in a healthy range. 

Making a plan to fast safely

When discussing the risk of fasting with your healthcare team it is important to agree a plan so you can fast safely.  

This may include: 

• Increasing blood sugar monitoring during this time and making sure you have enough supplies to do this. Checking your blood sugar levels does not break the fast, but you must break the fast if your blood sugars are too high or too low.
• What to do if your blood sugar is too low or too high, or if you become unwell. Learn more about your sick day rules. 
• Adjustments to your diabetes tablets, you may need a different type, or dose and need to know the best time to take them.  
• Adjustments to your insulin. You won’t need as much insulin before the start of the fast. Also, the type of insulin may need changing from your usual type. Remember, pre-mixed insulin is not recommended during fasting. 

Testing blood sugars during the fast

Risk of low blood sugar

If you take certain tablets or insulin, fasting carries the risk of low blood sugar (hypoglycaemia). This means it’s important for you to know the signs and symptoms of low blood sugar and to test your blood sugars more often during the fast, either with a blood sugar monitor or a continuous glucose monitor. 

If your blood sugars drop below 4 mmol/l you must break your fast and treat the hypo with some sugary food or fluid and follow this with something starchy as otherwise you will harm your body and may need medical attention. It’s a good idea to carry hypo treatments with you and a bottle of water during the fasting period. 

Risk of high blood sugar

You may develop high blood sugar levels during a fast if you miss your usual prescribed medication, if you have larger portions of starchy or sugary foods or if you are less physically active than normal. High blood sugars can increase your risk of dehydration which can make you feel dizzy and tired.  

Talk to your healthcare team about your blood sugar levels

Before choosing to fast, ask your healthcare team what a high blood sugar level is for you. If you go above that level during fasting, you must break the fast by drinking water and seek medical advice. Without medical advice this could lead to diabetic ketoacidosis (DKA) – a serious condition requiring hospital treatment. 

If you’re not able to get hold of your GP or diabetes team, it would be advisable not to fast, especially if you’re not sure of what to do with your diabetes medications. If you need urgent medical help, you can use the NHS 111 online service.