For the millions of Muslims with diabetes who fast during Ramadan, a new global study provides the clearest picture yet of who faces the greatest danger — and it comes down to a single factor: microvascular complications.
The research, published in the Journal of Diabetes and Endocrine Practice, analyzed data from 12,529 people with type 2 diabetes across multiple countries who participated in the 2020 and 2022 Diabetes and Ramadan (DAR) Global Surveys. The findings are both sobering and actionable.
“Having one or more microvascular complications more than doubled the odds of daytime hypoglycemia and hyperglycemia,” the authors report. Even more striking, the risk of severe events requiring medical attention increased dramatically with the number of complications — up to 6.5 times higher for severe hyperglycemia in those with all three complications.
The Scale of the Challenge
Ramadan fasting presents unique challenges for people with diabetes. With food and drink prohibited from dawn to sunset, medication timing must shift, and the risk of blood sugar swings increases dramatically.
In this study of over 10,000 people with type 2 diabetes who chose to fast, the numbers tell a concerning story:
Table 1: Glycemic Events During Ramadan Fasting
| Event Type | Percentage Affected | Broke Fast Due to Event | Required Medical Attention |
|---|---|---|---|
| Hypoglycemia (low blood sugar) | 15.5% | 9.2% | 1.8% |
| Hyperglycemia (high blood sugar) | 15.1% | 3.4% | 0.9% |
More than 15% of fasting participants experienced either hypoglycemia or hyperglycemia. Nearly 1 in 10 broke their fast due to low blood sugar, and almost 2% experienced severe hypoglycemia requiring emergency care.
The Microvascular Connection
The study focused on three specific microvascular complications that commonly affect people with diabetes:
- Neuropathy: Nerve damage that can impair the body’s ability to sense and respond to low blood sugar
- Nephropathy: Kidney damage that affects how medications are cleared from the body
- Retinopathy: Eye damage that often coexists with other complications
The prevalence of these complications in the study population was significant: 18.5% had neuropathy, 12.0% had retinopathy, and 9.3% had nephropathy. Most participants (69.5%) had no complications, but 22.8% had one, 6.1% had two, and 1.6% had all three.
Table 2: Impact of Microvascular Complications on Fasting Risks
| Number of Complications | Odds of Hypoglycemia | Odds of Breaking Fast (Hypo) | Odds of Severe Hypoglycemia | Odds of Severe Hyperglycemia |
|---|---|---|---|---|
| 1 complication | 2.16x higher | 2.25x higher | 1.47x higher | 2.94x higher |
| 2 complications | 2.31x higher | 2.84x higher | 1.82x higher | 3.69x higher |
| 3 complications | 2.19x higher | 3.13x higher | 3.50x higher | 6.49x higher |
All results statistically significant (p ≤ 0.05 to p ≤ 0.0001)
The pattern is clear: more complications mean higher risk. For severe hyperglycemia requiring medical attention, having all three complications increased the odds nearly six and a half times compared to those with none.
Neuropathy: The Silent Danger
Among the individual complications, neuropathy emerged as particularly dangerous. In adjusted analyses accounting for multiple factors, neuropathy was consistently associated with increased risk across nearly all outcomes.
This makes physiological sense. Diabetic autonomic neuropathy can damage the nerves that normally warn of approaching hypoglycemia — the shakiness, sweating, and heart palpitations that signal “treat your low blood sugar now.” Without these warning signs, people can slip into severe hypoglycemia without realizing it until it’s too late.
“Diabetic autonomic neuropathy, in particular, may impair the warning signs of low blood glucose and blunt the counterregulatory responses,” the researchers explain.
Who Fasts and Who Doesn’t
The study also revealed that people with complications were less likely to fast in the first place — suggesting some combination of medical advice and personal caution.
Compared to those with no complications:
- Those with one complication were 14% less likely to fast
- Those with two complications were 54% less likely to fast
- Those with three complications were 68% less likely to fast
And among those who did fast, each additional complication was associated with fasting about 0.7 fewer days of the month.
What This Means for the 200 Million Muslims with Diabetes
An estimated 200 million Muslims worldwide live with diabetes, and each year they face the decision: to fast or not to fast during Ramadan. Islamic law exempts those for whom fasting would be harmful, but many choose to observe for spiritual reasons.
This study provides crucial guidance for that decision-making process. The presence of microvascular complications — especially multiple complications — dramatically increases risk. Those with neuropathy face particular danger due to impaired hypoglycemia awareness.
The findings support current guidelines from organizations like the International Diabetes Federation and the Diabetes and Ramadan International Alliance, which recommend individualized risk assessment before Ramadan. People with diabetic nephropathy are already classified as high-risk; this study suggests neuropathy and retinopathy deserve similar attention.
Practical Implications for Patients and Doctors
For healthcare providers, the message is clear: pre-Ramadan assessments must go beyond basic blood sugar control and medication review. A thorough evaluation for microvascular complications — including simple screening questions for neuropathy symptoms — should be standard practice.
For patients, the findings offer empowerment through information. Knowing your personal risk profile allows for informed decisions about fasting and, if choosing to fast, closer monitoring and clearer plans for when to break the fast.
The study also highlights the importance of diabetes management year-round. Microvascular complications develop over years of suboptimal blood sugar control. Preventing them in the first place — through consistent management, regular check-ups, and lifestyle measures — is the ultimate protection.
Limitations and Future Research
The study has limitations. It relied on self-reported data, which can be subject to recall bias. The cross-sectional design captures associations but cannot prove causation. And the study didn’t track which specific medications participants used, which could influence risk.
Future research should explore whether certain medication adjustments before Ramadan can mitigate the increased risk associated with complications. Studies tracking continuous glucose monitoring during fasting could provide more detailed data on blood sugar patterns.
A Month of Spiritual Reward, Not Physical Harm
For Muslims with diabetes, Ramadan represents a profound spiritual opportunity. The goal of medical guidance should never be to discourage fasting outright, but to ensure that those who choose to fast can do so safely.
This study advances that goal by identifying who needs the most careful preparation and monitoring. With proper risk assessment, medication adjustment, and education, many people with diabetes — even those with complications — can navigate Ramadan safely.
As the researchers conclude, “Pre-Ramadan risk stratification should consider complication burden, especially neuropathy.” In a practice affecting millions annually, that simple insight could prevent countless emergencies and save lives.
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