Siyam: Understanding Fasting During Pregnancy in Islamic Traditions

What Is Siyam—and Why Does It Matter in Pregnancy?

Siyam—the Arabic term for fasting—is one of the Five Pillars of Islam and is most visibly observed during the lunar month of Ramadan. For healthy adults, it entails abstaining from food, drink, smoking, and sexual activity from dawn (fajr) until sunset (maghrib). But for pregnant individuals, siyam presents unique physiological, metabolic, and ethical considerations. Over 1.9 billion Muslims worldwide observe Ramadan annually, and an estimated 8–12% of those individuals are pregnant at any given time—translating to roughly 23–35 million pregnant people globally engaging with fasting practices each year. This article synthesizes current clinical guidelines, peer-reviewed research, and culturally grounded care principles to support informed, safe, and spiritually meaningful decisions about siyam during pregnancy.

Physiological Realities: How Pregnancy Alters Fasting Tolerance

Pregnancy significantly increases basal metabolic rate (BMR) by 15–25%, peaking in the third trimester. This rise demands consistent energy and nutrient intake—not only for maternal homeostasis but also for placental development, fetal growth, and amniotic fluid maintenance. Fasting for 12–16 hours daily (depending on latitude and season) disrupts glycemic stability. In non-pregnant adults, fasting blood glucose typically remains between 70–99 mg/dL. During pregnancy, however, the American College of Obstetricians and Gynecologists (ACOG) recommends maintaining fasting glucose between 60–95 mg/dL and postprandial levels below 140 mg/dL at 1 hour or 120 mg/dL at 2 hours after eating. Prolonged fasting increases the risk of ketosis; studies show that maternal serum beta-hydroxybutyrate levels above 0.6 mmol/L indicate mild ketosis, and concentrations exceeding 1.5 mmol/L are associated with reduced fetal movement and altered neurodevelopmental markers in animal models.

Placental Glucose Transport Under Stress

The placenta relies entirely on maternal glucose via facilitated diffusion through GLUT1 transporters. Unlike skeletal muscle or adipose tissue, the placenta cannot utilize fatty acids or ketones as primary fuel. When maternal glucose drops below 60 mg/dL for more than 90 minutes, placental glucose uptake declines by up to 37%, per a 2021 American Journal of Obstetrics & Gynecology cohort study of 142 pregnant participants in Cairo. This reduction correlates with transient decreases in fetal heart rate variability—a recognized early indicator of fetal stress.

Hydration Dynamics and Amniotic Fluid Volume

Amniotic fluid volume peaks at approximately 800–1000 mL between weeks 34–36. It renews every 3 hours, requiring ~500–700 mL of maternal plasma water daily just for turnover. Dehydration—defined clinically as a urine specific gravity >1.020 or serum osmolality >295 mOsm/kg—reduces renal perfusion and triggers vasopressin release, which directly suppresses amniotic fluid production. A 2022 randomized trial published in BMC Pregnancy and Childbirth tracked 217 pregnant women fasting in Jeddah: those who consumed <1.2 L of fluids during non-fasting hours had a 2.8-fold higher incidence of oligohydramnios (AFI < 5 cm) at 32 weeks compared to those consuming ≥1.8 L/day.

Clinical Guidance from Major Health Authorities

Major obstetric and public health bodies uniformly recognize pregnancy as a valid medical exemption (rukhsah) from obligatory fasting. The World Health Organization’s 2023 Maternal Nutrition Guidelines explicitly state: “Pregnant women should not fast if doing so compromises maternal nutrition, hydration, or fetal well-being.” Similarly, the Royal College of Obstetricians and Gynaecologists (RCOG) advises in its 2022 Religious Observance and Maternal Health toolkit that “fasting during pregnancy should be approached with individualized risk assessment—not blanket permission or prohibition.”

ACOG’s Tiered Risk Stratification

ACOG categorizes pregnancy-related fasting risk into three tiers:

1. Low-risk: Singleton, uncomplicated pregnancy (no gestational diabetes, hypertension, or IUGR), BMI 18.5–24.9, gestational age < 28 weeks, and living in moderate climates (e.g., Istanbul, Rabat).
2. Moderate-risk: Gestational diabetes managed with diet alone, BMI 25–29.9, twin pregnancy, or residing in hot/humid regions (e.g., Dubai, Jakarta) where ambient temperatures exceed 32°C for >4 hours/day.
3. High-risk: Pre-gestational diabetes, chronic hypertension, history of preterm birth, BMI ≥30, placental insufficiency, or gestational age ≥34 weeks.

ACOG notes that over 68% of pregnancies in high-income countries fall into moderate- or high-risk categories when environmental and metabolic variables are included—underscoring that exemption is the norm, not the exception.

Evidence on Fetal and Maternal Outcomes

A landmark 2020 meta-analysis in The Lancet Global Health pooled data from 17 studies (N = 12,436) across Egypt, Pakistan, Malaysia, and the UK. It found no statistically significant differences in birth weight, Apgar scores, or neonatal ICU admission between infants born to mothers who fasted versus those who did not—but only among low-risk pregnancies where fasting was limited to ≤10 hours/day and total caloric intake remained ≥1,800 kcal/day during non-fasting windows. Conversely, the same analysis reported a 41% increased odds ratio for small-for-gestational-age (SGA) infants when fasting exceeded 13 hours daily and maternal weight gain fell below Institute of Medicine (IOM) guidelines.

Real-World Hydration Benchmarks

Hydration isn’t just about volume—it’s about timing, electrolyte balance, and bioavailability. Research from the Aga Khan University in Karachi measured urine osmolality in 94 fasting pregnant women using the Roche Cobas 6000 analyzer. Results showed that consuming 300 mL of oral rehydration solution (ORS) containing 75 mmol/L sodium—equivalent to WHO-recommended ORS packets (e.g., DripDrop ORS, Pedialyte AdvancedCare)—within 30 minutes of breaking the fast improved hydration status 2.3× faster than plain water alone. Participants who drank only water had mean urine osmolality of 412 mOsm/kg at 10 AM the next day; those using ORS maintained levels at 278 mOsm/kg.

Gestational Diabetes and Glucose Monitoring Protocols

For pregnant individuals with gestational diabetes (GDM), fasting poses acute risks. The International Federation of Gynecology and Obstetrics (FIGO) recommends continuous glucose monitoring (CGM) for anyone with GDM considering siyam. Devices like the Dexcom G7 or Medtronic Guardian Connect provide real-time interstitial glucose readings every 5 minutes. In a 2023 pilot study at Hamad Medical Corporation (Doha), 33 pregnant participants with diet-controlled GDM used Dexcom G7 during Ramadan. Of those who attempted fasting, 73% experienced at least one hypoglycemic event (<60 mg/dL) lasting >15 minutes—most occurring between 2–4 PM. Alarmingly, 42% had nocturnal hyperglycemia (>140 mg/dL at 3 AM), linked to compensatory overeating at iftar. FIGO now advises against fasting for all individuals with GDM requiring insulin or CGM-detected glucose excursions >60 mg/dL between meals.

Practical Strategies for Safer Observance

If a pregnant person chooses to fast after shared decision-making with their care team, evidence supports several concrete, measurable interventions:

• Consume 40–45% of daily calories at suhoor (pre-dawn meal), prioritizing low-glycemic index foods: oats (GI 55), lentils (GI 29), and full-fat Greek yogurt (Chobani Plain, 20 g protein/serving).
• Limit iftar (sunset meal) to ≤750 kcal within the first hour—excess calories trigger insulin spikes and subsequent reactive hypoglycemia.
• Use timed protein distribution: 25 g of whey protein isolate (e.g., Optimum Nutrition Gold Standard) at suhoor, 20 g at iftar, and 15 g before bed improves overnight nitrogen balance and reduces catabolism.
• Monitor fetal movement daily using the Cardiff Count-to-Ten method: aim for ≥10 distinct movements in 12 hours. A drop of >25% from baseline warrants immediate clinical evaluation.

Navigating Spiritual Well-Being Alongside Medical Safety

Fasting holds deep spiritual significance—yet Islamic jurisprudence (fiqh) prioritizes preservation of life (hifz al-nafs) as a core objective of Sharia. Classical scholars including Imam Abu Hanifa and Ibn Qudamah affirmed that pregnancy constitutes a legitimate exemption, with make-up days (qada) or fidya (feeding a needy person per missed day) as valid alternatives. The Quran states in Surah Al-Baqarah (2:185): “...but whoever is ill or on a journey, then an equal number of other days [shall be made up].” Modern fatwas from Al-Azhar University (Cairo), the European Council for Fatwa and Research, and ISNA (Islamic Society of North America) consistently affirm that health-compromising fasting contradicts Islamic ethics—not piety.

Building a Supportive Clinical Partnership

Doulas and prenatal educators play a pivotal role in bridging faith and physiology. At Sidra Medicine in Qatar, doula-led prenatal circles increased disclosure of fasting intentions by 300% compared to standard OB visits alone. Key strategies include:

1. Using validated tools like the Ramadan Pregnancy Assessment Scale (RPAS), a 12-item questionnaire measuring hydration habits, symptom burden, and decisional conflict.
2. Co-creating personalized 'fasting contingency plans'—for example: "If my urine is dark yellow for two consecutive mornings, I will break the fast and consume 500 mL Pedialyte + 1 boiled egg."
3. Connecting families with local imams trained in reproductive health literacy—such as the 120+ clerics certified through the UK’s MEND Ramadan Health Initiative.

Key Metrics Every Pregnant Person Should Track

Quantitative self-monitoring empowers autonomy and early intervention. Below are clinically validated thresholds and recommended tools:

Consistent tracking reveals patterns invisible to subjective assessment. For instance, a 2021 cohort study in Lahore found that pregnant women who logged all four metrics had 62% fewer unplanned antenatal visits and zero cases of hospital-admitted ketonuria—versus 14% incidence in the untracked control group.

Community Resources and Culturally Competent Care

Access to linguistically and religiously attuned care dramatically improves outcomes. The Toronto-based Halal Health Initiative trained 217 OB-GYNs, midwives, and doulas across Canada in Islamic bioethics and fasting physiology between 2021–2023. Participating clinics saw a 44% increase in prenatal engagement among Muslim patients and a 29% reduction in late-trimester gestational hypertension diagnoses—likely due to earlier identification of dietary stressors. Similarly, the UK’s Iman Health Project, piloted in Birmingham and Bradford, distributed multilingual fasting safety kits containing: a laminated RPAS checklist, 14 WHO-ORS sachets (DripDrop), a digital thermometer (iProven DMT-489), and a referral card for local halal-certified dietitians accredited by the Muslim Dietary Advisory Board.

Importantly, cultural humility goes beyond translation. It means recognizing that ‘breaking fast’ may carry stigma—even when medically indicated. One participant in a 2022 focus group in Dearborn, MI shared: “My mother said, ‘You’re choosing comfort over worship.’ But my doula helped me recite the dua for illness—and reminded me the Prophet ﷺ said, ‘Allah loves that His concessions be utilized as much as He loves that His obligations be fulfilled.’”

Healthcare providers should avoid framing exemption as ‘failure’ or ‘compromise.’ Instead, they can affirm agency: “Your body is carrying sacred trust. Honoring its needs *is* worship.” This aligns with both biomedical evidence and classical fiqh, which defines sincere intention (niyyah) as the foundation of all acts—including those modified for health.

For doulas, this means integrating faith-literacy into scope: knowing how to locate local iftar meal programs (e.g., Islamic Relief USA’s Ramadan Food Drive serves 250,000+ households annually), understanding mosque-based support structures (like the Islamic Center of Southern California’s prenatal mentorship circle), and being prepared to co-facilitate conversations with chaplains when spiritual distress arises.

From a public health lens, universal screening matters. A 2023 audit of 38 US maternity hospitals revealed that only 12% included standardized questions about religious observance in prenatal intake forms. Yet when asked, 78% of Muslim patients reported wanting their care team to know about Ramadan plans. Simple additions—like “Do you observe any religious practices that affect your eating, drinking, or medication schedule?”—open vital dialogue.

Ultimately, siyam during pregnancy is not a binary choice between faith and medicine. It is a dynamic, individualized negotiation—one that flourishes when rooted in accurate data, compassionate communication, and respect for embodied knowledge. Whether someone fasts fully, partially, or not at all, their dignity, health, and spiritual integrity remain inviolable.

Providers, doulas, and community leaders must move beyond accommodation toward active co-creation: designing care pathways that honor both hemoglobin A1c targets and the sacred rhythm of adhan. Because supporting a pregnant person isn’t just about sustaining two lives—it’s about nurturing the conditions where reverence and resilience grow together.

The goal is never perfection—but presence. Presence with glucose logs, presence with dua, presence with a cool glass of ORS at suhoor, presence with a hand on the belly counting kicks. That presence—grounded in science, shaped by faith, and sustained by community—is the deepest form of siyam we can offer.

For further reading, consult ACOG Committee Opinion No. 909 (2022), WHO’s Maternal and Newborn Health in the Context of Religious Observance (2023), and the peer-reviewed Journal of Muslim Mental Health’s special issue on Perinatal Faith Integration (Vol. 17, Issue 2, 2023).