Ramadan Fasting with Type 2 Diabetes and CKD Stage 3b
A 54-year-old Kuwaiti woman with a 12-year history of type 2 diabetes attends the diabetes clinic before Ramadan. BMI 32 kg/m2, HbA1c 8.4%, eGFR 38 mL/min/1.73 m2 (CKD stage 3b), urine albumin-to-creatinine ratio 120 mg/g, potassium 4.9 mmol/L, bicarbonate 22 mmol/L, BP 138/84 mmHg. Current medication: metformin 1 g twice daily, gliclazide MR 60 mg with breakfast, and insulin glargine 18 units at 22:00. She is determined to fast the whole month. In Kuwait the fast lasts about 15.5 hours; she breaks the fast at sunset with three dates and gahwa, eats a large machboos at 21:00, sleeps after midnight and takes suhoor at 03:00. Last Ramadan she recorded two capillary glucose readings of 3.1 mmol/L in the late afternoon, one episode of dizziness, and lost 2 kg.
1. Risk-stratify her fasting using a recognised framework, and explain how you would handle her determination to fast in a way that protects both her and the professional relationship.
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She falls into the high-risk category, not the very-high-risk category. High-risk features present: sulfonylurea (gliclazide), insulin therapy, CKD stage 3, and a history of hypoglycaemia during previous fasting. Very-high-risk features such as dialysis, CKD stage 5, or severe recurrent hypoglycaemia in the past three months are absent, and HbA1c is 8.4% rather than above 9%.
The classification is not a veto, it is a structured way to frame the conversation. I would state plainly that current guidance advises against fasting for someone with her combination of risks, explain the specific mechanisms (sulfonylurea plus a 15.5-hour fast without food, and reduced insulin clearance in CKD, both prolong hypoglycaemia), and record that advice in the notes.
If she still chooses to fast, the professional obligation shifts to risk mitigation: shared decision-making documented in her file, agreement that she will monitor capillary glucose at least four times daily (pre-dawn, midday, before iftar, and 2 hours after), a written rule that she breaks the fast immediately if glucose is below 3.9 mmol/L or above 16.7 mmol/L, and an explicit instruction to attend the emergency department for any hypoglycaemia requiring assistance.
2. Propose medication changes to discuss with her physician for the fasting month, with the reasoning for each.
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Metformin: eGFR 38 permits metformin but the dose must be reduced - maximum 1,000 mg/day at this eGFR, and it should not be started in anyone below 45. I would suggest 500 mg with iftar and 500 mg with suhoor, and recheck creatinine after the month. It carries minimal hypoglycaemia risk but accumulates if renal function declines further.
Gliclazide MR 60 mg taken at breakfast is the most dangerous element of her regimen during fasting: a sulfonylurea taken at 07:00 with no food for 15.5 hours is the most plausible explanation for her 3.1 mmol/L readings last Ramadan. Options to discuss are switching the dose to iftar and halving it, or stopping it and relying on basal insulin, depending on her daytime readings.
Insulin glargine 18 units at 22:00 should move to iftar and be reduced, typically by 15-30% at this HbA1c, with titration against pre-dawn glucose. Protein and sodium handling also matter: at eGFR 38 with an ACR of 120 mg/g she needs an ACE inhibitor or ARB review and a sodium intake under 2 g/day, because a Ramadan diet heavy in pickles, salty cheese and processed suhoor foods will raise her BP and albuminuria even if her glucose looks acceptable.
3. Design her nutrition and hydration plan across the iftar-suhoor window, including protein prescription, and the practical counselling points specific to her usual Kuwaiti intake pattern.
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Energy: BMI 32 with CKD, so a modest deficit of about 500 kcal/day rather than a strict weight-loss diet, which risks muscle loss in someone eating only within a 8.5-hour window. Protein 0.8 g/kg/day - around 55-65 g using adjusted body weight for her BMI - distributed between iftar and suhoor, with at least 25 g at suhoor so the overnight fast does not become a catabolic 15-hour stretch. Potassium 4.9 mmol/L and bicarbonate 22 mmol/L call for individualised potassium restriction (roughly 2,700-3,000 mg/day) and attention to acidosis, so avoid potassium-based salt substitutes.
Hydration: 1.5-2 L of fluid spread across the non-fasting hours, roughly 2-3 glasses at iftar, 2-3 after the meal, and 2 at suhoor. Gahwa and karak tea are diuretics and cannot count towards this.
Practical points for her usual pattern: keep the three dates but count them (about 60-70 kcal and 15 g carbohydrate), avoid breaking the fast with large volumes of sweet juice, halve the rice portion in machboos and increase the vegetable and grilled protein component, replace fried samosas and salty pickles with laban (unsweetened), salad and grilled fish or chicken, and make suhoor a slow-digesting meal such as foul medames, eggs or cheese with wholemeal bread rather than sweets. Emphasise that the 21:00 large meal followed by sleep promotes reflux and poor glycaemic control, and suggest moving it earlier and splitting it.