Intermittent fasting has attracted considerable attention as a strategy for improving blood sugar control and promoting weight loss in Type 2 diabetes. The evidence is promising, but the approach requires careful consideration — particularly for people on insulin or sulphonylureas.
What Is Intermittent Fasting?
Intermittent fasting (IF) is an umbrella term for eating patterns that cycle between periods of fasting and eating. The most studied approaches include:
- 16:8 (Time-Restricted Eating): Eating within an 8-hour window and fasting for 16 hours each day
- 5:2 Diet: Eating normally for five days per week and restricting calories to 500–600 on two non-consecutive days
- Alternate Day Fasting: Alternating between normal eating days and fasting or very low calorie days
Evidence in Type 2 Diabetes
A 2023 study published in The New England Journal of Medicine found that time-restricted eating (8-hour window) produced similar HbA1c reductions to calorie restriction in people with Type 2 diabetes, with comparable weight loss. A meta-analysis of 27 trials found that intermittent fasting reduced fasting glucose by an average of 0.15 mmol/L and HbA1c by 0.15% compared to unrestricted eating.
The benefits appear to stem from both caloric restriction and the metabolic effects of fasting itself, including improved insulin sensitivity and reduced inflammation.
⚠️ Important Safety Warning
Intermittent fasting carries a significant risk of hypoglycaemia for people taking insulin or sulphonylureas (such as gliclazide or glibenclamide). Medication doses must be adjusted before starting any fasting regimen. Do not attempt intermittent fasting without first discussing it with your diabetes care team and agreeing on a medication adjustment plan.
Who Is Intermittent Fasting Most Suitable For?
IF is most appropriate for people with Type 2 diabetes who are managed with diet alone or with metformin, as these medications do not carry a significant hypoglycaemia risk during fasting. For people on insulin or sulphonylureas, IF can still be considered but requires careful medical supervision and medication adjustment.
✅ Key Takeaway
Intermittent fasting can be an effective strategy for improving blood sugar control and promoting weight loss in Type 2 diabetes. However, it is not suitable for everyone and requires medical supervision, particularly for those on insulin or sulphonylureas. If you are interested in trying IF, discuss it with your diabetes care team first.
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