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Real members of DiabetesTeam have posted questions and answers that support our community guidelines, and should not be taken as medical advice. Looking for the latest medically reviewed content by doctors and experts? Visit our resource section.

I read on DT that fasting is dangerous to diabetics. A member stated that he was fasting and I cautioned him against it. Was I wrong?

A DiabetesTeam Member asked a question 💭
Durban, ZA
February 11
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Answer Summary

Members discussed whether cautioning someone against fasting with diabetes was appropriate, with the consensus strongly supporting the warning... Read more

Members discussed whether cautioning someone against fasting with diabetes was appropriate, with the consensus strongly supporting the warning due to serious risks like hypoglycemia, hyperglycemia, and diabetic ketoacidosis, especially for those on insulin or sulfonylureas. Several members emphasized that while some people with well-controlled Type 2 diabetes may fast safely under strict medical supervision, it should never be done without doctor approval and medication adjustments, as the dangers can be life-threatening. A recurring theme was the importance of advocating for fellow community members' safety even when met with resistance, with one member sharing how lack of proper diabetes education led to her mother's preventable leg amputation, reinforcing why these cautionary conversations matter deeply.

A DiabetesTeam Member

Fasting is Good but depends on your diabetic condition l always fast once a week to giive thanks to God for his continuous guidance, love and good health towards me & family

February 11
DiabetesTeam

Is fasting dangerous for people with diabetes?

You weren't entirely wrong to be cautious, but the answer isn't black and white. Fasting can be risky for people with diabetes, but it's not automatically dangerous for everyone. The safety really depends on individual circumstances.

Fasting carries specific risks for people Show Full Answer

Is fasting dangerous for people with diabetes?

You weren't entirely wrong to be cautious, but the answer isn't black and white. Fasting can be risky for people with diabetes, but it's not automatically dangerous for everyone. The safety really depends on individual circumstances.

Fasting carries specific risks for people with diabetes:

- Hypoglycemia (low blood sugar) - especially if medications aren't adjusted properly
- Hyperglycemia (high blood sugar) - can occur during longer fasting periods if insulin levels aren't adequate
- Dehydration - fasting increases this risk

However, some people with diabetes can fast safely when it's done under medical supervision with proper planning. Short-term studies show intermittent fasting can be safe for people with insulin-treated type 2 diabetes when properly monitored.

Key factors that determine safety:

- Type of diabetes (type 1 vs type 2)
- Whether insulin is used and dosage amounts
- Other medications being taken
- Length of the fasting period
- Presence of complications like kidney disease

The most important point: Anyone with diabetes should always talk to their doctor before fasting. A healthcare provider can help create a safe fasting management plan with medication adjustments, blood sugar monitoring schedules, and guidelines for when to stop fasting if readings become unsafe.

Your concern was valid - fasting without medical guidance can be dangerous. But with proper supervision, some people can fast safely.

February 11
A DiabetesTeam Member

If you are prone to big swings high or low I would discourage fasting. For those who swing both ways I suggest grazing! Personally I find fasting helpful.

February 11 (edited)
A DiabetesTeam Member

Hi @A DiabetesTeam Member.
If you are taking insulins or sulfonureas you could have a severe hypo and die with fasting.

There are problems if you are doing other diabetes medications too.

Only fast with a doctors tight oversight if you are diabetic.

Personally I have fasted for 45 years. 4 days - 4x each spring and 4x each fall.

I am now doing diabetes medications. I will not fast anymore.

February 11
A DiabetesTeam Member

Hugs to Hkc, Lorna8KZN & Aundre. Happy mid week.

February 11 (edited)

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