Ramadan and gestational diabetes: maternal and neonatal outcomes

Effect of Ramadan Fasting in Turkey Upon Fetal Well-being and Perinatal Outcomes During the Last-Trimester of Pregnancy

Ramadan, a one-month period in which eating and drinking are prohibited from sunrise to sunset, is considered sacred by Muslims. According to Islamic rules, fasting is obligatory for adults and healthy people, but patients and travelers are exempted from this rule. It is not clear whether pregnant women can fast during Ramadan. This cross-sectional case-control study included low-risk pregnant women at 32-37 weeks of gestation in Turkey. We examined healthy women in the last period of their pregnancy and found similar perinatal outcomes between the fasting and nonfasting participants. In the evaluation of fetal well-being, a decrease in the number of accelerations in the non-stress test (NST) and the need to repeat the test were found to be statistically significantly higher in fasting pregnant women. We consider that this may prolong the evaluation period and increase unnecessary hospitalizations due to nonreactive NST results. More randomized controlled trials are needed to conclude that fasting during pregnancy is safe.

Maternal and perinatal outcome of Ramadan fasting in women with gestational diabetes

Objective

To compare maternal and perinatal outcome of Ramadan fasting during pregnancy in women with/without gestational diabetes.

Methods

This prospective case-control study was conducted at Department of Obstetrics & Gynecology Unit 1 Ruth PKM Civil Hospital & Dow Medical College and Holy Family Hospital, Karachi during 1st April to 31st July, 2022. In this study normoglycemic pregnant women and those identified as gestational diabetes (n=52) on oral glucose tolerance test, who fasted during Ramadan were included. Women, on diet control or diet plus metformin were included in the study. Study questionnaire included demographic details, days of fasting, self-reported hypoglycemic episodes. Maternal outcomes included preterm birth, pregnancy induced hypertension. Perinatal outcome included hyperbilirubinemia, hypoglycemia, weight of placenta, and apgar score.

Result

Eighty two women were included in the study, gestational diabetes (n=57) and normoglycemic (n=25). Average days of fasting were 16 ±9.0 days (range 5-30). Women with GDM were older (28.6 vs. 26.0 years, p-value=0.034), had raised levels of HbA1c (5.5 vs. 5.1, p-value=0.004), mean FBS (102.8 vs. 84.6 mg/dl, p-value <0.001), mean RBS (135.3 vs. 106.4 mg/dl, p-value <0.001) and had higher BMI at delivery (31.0 vs. 26.6 kg/m2, p-value=0.004). HbA1c (p-value=0.016) and head circumference of baby (p-value=0.038) were found lower in the group who fasted for more than 20 days among normoglycemic pregnant women. No other maternal and neonatal outcomes were found to be significantly affected by Ramadan fasting among pregnant women with/without GDM.

Conclusion

Gestational diabetes do not affect maternal and perinatal outcome among pregnant women.

Chrononutrition during Pregnancy and Its Association with Maternal and Offspring Outcomes: A Systematic Review and Meta-Analysis of Ramadan and Non-Ramadan Studies

Much evidence suggests that food intakes and eating patterns are major determinants of the phase of peripheral circadian clocks, and desynchronization between them is thought to contribute to the development of metabolic disorders. However, much remains to be understood about how different dimensions of chrononutrition during pregnancy affect pregnant women's and their offspring's health outcomes. Therefore, we systematically reviewed and integrated all emerging evidence on chrononutrition during pregnancy (including meal skipping, meal frequency, night eating, and (Ramadan) fasting) and their relationships with maternal and offspring outcomes. The results suggest that meal skipping and night eating during pregnancy were generally associated with adverse pregnancy and birth outcomes, whereas no strong conclusion could be reached for meal frequency. In our meta-analysis, Ramadan fasting did not seem to be related with birth weight or gestational age at birth, but evidence for other mother-offspring outcomes was inconsistent. To further elucidate the effect of chrononutrition factors on maternal and offspring health outcomes, larger and well-conducted prospective cohort and interventional studies are needed. In addition, information on covariates such as physical activity, sleep, diet quality and quantity, fasting days, fasting period per day, and trimester exposure should also be collected and considered during analysis.

Ramadan Fasting and Maternal and Fetal Outcomes in Pregnant Women with Diabetes Mellitus: Literature Review

There is an emerging Muslim and diabetic population in the United States and other Western countries and majority of pregnant women and patients with diabetes mellitus choose to fast during Ramadan. Fasting during Ramadan in pregnant women with diabetes may represent a 'perfect storm' of metabolic disturbances including hyperglycemia, hypoglycemia and ketosis. Recent continuous and flash glucose monitoring data suggests increased glycemic variability (fasting hypo- and post-Iftar hyperglycemia) in non-pregnant patients with diabetes during Ramadan. Only five small-scale studies, predominantly focused on women with gestational diabetes mellitus in Muslim-majority nations have explored maternal glycemic outcomes during Ramadan which is associated with lower mean blood glucose levels and higher frequency of fasting hypoglycemia. Data is limited however on important clinical outcomes such as symptomatic and serious hypoglycemia requiring hospitalization. Results have been conflicting regarding maternal Ramadan fasting and association with fetal outcomes in women without diabetes. Only one recently published study reported on perinatal outcomes in pregnant women with gestational diabetes which found no effect of Ramadan exposure on mean birthweight or macrosomia frequency but lower neonatal hypoglycemia prevalence, however a significant limitation was lack of documentation of maternal fasting status. At this stage, due to paucity of data, the current medical recommendation is against Ramadan fasting for pregnant Muslim women with diabetes. Large-scale population-based studies are warranted regarding maternal and fetal outcomes in pregnant fasting women with diabetes and such studies should characterize maternal fasting status and have meaningful and consistent clinical outcomes. High-quality data derived from these studies can assist clinicians in providing more evidence-based advice to safely navigate both mother and fetus through a potentially challenging pregnancy.