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Fasting during Ramadan is one of the five pillars of Islam and is obligatory for all healthy Muslims from the age of puberty. Though individuals with some illness and serious medical conditions, including some people with diabetes, can be exempted from fasting, many will fast anyway. It is of paramount importance that people with diabetes that fast are given the appropriate guidance and receive proper care. The International Diabetes Federation (IDF) and Diabetes and Ramadan (DaR) International Alliance have come together to provide a substantial update to the previous guidelines. This update includes key information on fasting during Ramadan with type 1 diabetes, the management of diabetes in people of elderly ages and pregnant women, the effects of Ramadan on one's mental wellbeing, changes to the risk of macrovascular and microvascular complications, and areas of future research. The IDF-DAR Diabetes and Ramadan Practical Guidelines 2021 seek to improve upon the awareness, knowledge and management of diabetes during Ramadan, and to provide real-world recommendations to health professionals and the people with diabetes who choose to fast., (Copyright © 2021. Published by Elsevier B.V.)

Physiological impact of the intermittent or prolonged fasting is known from various studies on healthy subjects. However, data on impact of fasting on biochemical and biometric parameters in people with diabetes is building up. Safety of Ramadan fasting has always been assessed after Ramadan. This study looked into the immediate effect of fasting during the fasting days compared to time before and after the fasting month., Methods: This is an observational study. We looked into people with biometric and biochemical records before Ramadan, and we followed them up during and after Ramadan prospectively. We were aiming for assessing the biochemical and biometric changes for people with diabetes during Ramadan in comparison to pre-and post Ramadan. As well as the differences between these measures according to type and treatment of diabetes in those who fasted as well as in those who did not fast during Ramadan., Results: Total of 342 patients were recruited to the study. All were patients with diabetes at a mild to moderate risk of complications if fasted. Majority were males 52.3% (n = 180), while females were 47.7% (n = 162). Most of the results showed a U shape between Pre-Ramadan, During Ramadan and Post-Ramadan periods. there was a modest but significant reduction in weight but regained after Ramadan., Conclusions: Our study suggests that for many people with diabetes fasting is not associated with an increased risk to their glycemic control, their weight and/or their blood pressure. Indeed, what is seen is marginal benefit or no change in all parameters. This stratifies the ongoing recommendation that allows patients with categorized as low risk to fast Ramadan or non-Ramadan days whenever desired., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.)

Aims: There is limited evidence that evaluates the impact of fasting during Ramadan in pregnant women. We explored the safety of fasting in Gestational Diabetes Mellitus (GDM) in Ramadan, while understating the glycemic variability., Methods: 25 patients with GDM who choose to fast, were enrolled and provided optimum care that included Ramadan focused education and FreeStyle LibreFlashContinuous Glucose Monitoring(FSL-CGM) was utilized for 2-4 weeks assessment period of non-Ramadan days plus 2-3 weeks during Ramadan and medication adjustment., Results: The average glucose improved significantly, while time in target and percent above target numerically improved during Ramadan compared to pre-Ramadan. There was significant increment on the number of hypoglycemic events in Ramadan. The average lowest blood glucose reading reduced significantly by 14 mg/dL with average duration of hypoglycemic events increased significantly by 38.5 min., Conclusion: Our study reinforces the importance of structured education before Ramadan to deliver optimal care for the management of diabetes. Strikingly FSL-CGM demonstrated that hypoglycemia is significantly increased during Ramadan Fasting. There was effective reflection of hyperglycemic spikes, immediately post Iftar. The results corroborated with the earlier studies for higher frequency of hypoglycemia during Ramadan fasting, under similar standards of care in high-risk patients with diabetes., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.)

Background: All diabetes and Ramadan guidelines advice against fasting for people with type 1 diabetes, however, many insist on fasting. Consequently, this causes a challenge due to the risk of hypoglycaemia, hyperglycemia ± diabetic ketoacidosis., Aim: To assess the impact of optimum care, which includes Ramadan-focused education, flash glucose monitoring, dietary advice and treatment adjustment on the safety of Ramadan fasting in people with type 1 diabetes., Methods: Thirty persons with type 1 diabetes who insisted to fast during Ramadan were recruited to the study. At pre-Ramadan visit, all patients received Ramadan focused education and Freestyle Libre (FSL) sensor insertion and training. Patients used the sensor for 6 weeks (pre-Ramadan and during Ramadan). The physical and biological parameters were collected 2-4 weeks before and after Ramadan., Results: 22 patients on basal bolus insulin and 2 on an insulin pump had FSL data. Average number of days fasted were 24. Learning benefits was reported by 95% of patients following pre-Ramadan educational session. There was no clinically significant change in physical and/or biological data between pre and post-Ramadan. 63% reported making insulin dose adjustments in Ramadan. Flash glucose monitoring data showed 46.7% of patients had more than 10 hypoglycemic episodes in the 2 weeks prior to Ramadan compared to 29.2% during Ramadan. However, none of the data were statistically significant apart from HbA1c which reduced from prior to RamadanHbA1c of 8.2% to 7.9% post Ramadan (P 0.010). There was one DKA on 2nd day of Ramadan, reported due to missing insulin dose to avoid hypoglycemia., Conclusion: Optimal care of selective patients with type 1 diabetes with a low complication rate may allow Ramadan fasting with improvement in glycemic control and without an increase in hypoglycemia, biometric or metabolic parameters. Larger, randomized controlled trials are required to be able to generalize this as a recommendation., Competing Interests: Declaration of Competing Interest All authors declare no conflicts of interest., (Copyright © 2020 Elsevier B.V. All rights reserved.)

Introduction: Fasting the holy month of Ramadan is passionately practiced by all Muslim population around the world. Patients with diabetes are generally considered to have a higher risk of fasting. The current international guidelines have risk-stratified the patients with diabetes and other comorbidities to different categories, and the decision of fasting or not is made based on this categorization. Many studies looked at the impact of Ramadan fasting on those high-risk patients, and many are currently being in progress., Methods: In this systematic review, we conducted an extensive search in PubMed and google scholar engines. Studies filtration focused only on the Randomized controlled trial (RCT) and prospective observational studies accomplished between the year 2007 up to March2019 on impact of Ramadan on patients with diabetes at high risk of fasting., Results: The global dissemination and implementation of the guidelines for the management of diabetes during Ramadan broke the inertia among health care providers. Additionally, the concept of pre-Ramadan assessment for risk categorization, therapeutic doses modification in hand with self -monitoring blood glucose; have markedly reduced the risk and hospitalisation during Ramadan., Conclusions: There is still limited data on fasting Ramadan by high risk patients with diabetes. There was minimal diversity in the published results, however, Generally and despite the education, self-titration; the incidences of complications during Ramadan is minimally higher than other times of the year in this group., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier B.V. All rights reserved.)

Background and Purpose: The prognostic value of radiomics for non-small cell lung cancer (NSCLC) patients has been investigated for images acquired prior to treatment, but no prognostic model has been developed that includes the change of radiomic features during treatment. Therefore, the aim of this study was to investigate the potential added prognostic value of a longitudinal radiomics approach using cone-beam computed tomography (CBCT) for NSCLC patients., Materials and Methods: This retrospective study includes a training dataset of 141 stage I-IV NSCLC patients and three external validation datasets of 94, 61 and 41 patients, all treated with curative intended (chemo)radiotherapy. The change of radiomic features extracted from CBCT images was summarized as the slope of a linear regression. The CBCT slope-features and CT-extracted features were used as input for a Cox proportional hazards model. Moreover, prognostic performance of clinical parameters was investigated for overall survival and locoregional recurrence. Model performances were assessed using the Kaplan-Meier curves and c-index., Results: The radiomics model contained only CT-derived features and reached a c-index of 0.63 for overall survival and could be validated on the first validation dataset. No model for locoregional recurrence could be developed that validated on the validation datasets. The clinical parameters model could not be validated for either overall survival or locoregional recurrence., Conclusion: In this study we could not confirm our hypothesis that longitudinal CBCT-extracted radiomic features contribute to improved prognostic information. Moreover, performance of baseline radiomic features or clinical parameters was poor, probably affected by heterogeneity within and between datasets., (Copyright © 2019 The Authors. Published by Elsevier B.V. All rights reserved.)

Aim: To understand the risk of hypoglycaemia during Ramadan fasting by use of CGM, as well as to observe the Glycemic control and renal functions in patients with diabetes and chronic kidney disease stage 3 (CKD-3)., Method: A prospective interventional study conducted in the Dubai Hospital, a tertiary care centre in the United Arab Emirates, during the month of Ramadan 1437 AH (Hijri), which corresponded to June 6th till July 5th, 2016. 25 patients with type 2 diabetes and stage 3 chronic kidney disease (CKD stage 3) were included in the study, who intended to fast during Ramadan. The aim was to observe the serum glucose level through 24 h FreeStyle Libre flash continuous glucose monitor (FSL-CGM). Most patients had three sensors during the study, covering an average three weeks during Ramadan and three weeks outside Ramadan (Sha'ban and shawal). We also monitored the change in, BP, HBA1c, kidney functions and BMI before and after Ramadan., Results: This study included 25 adults with a mean age of 60 (±14 years). Fasting Ramadan did not result in any significant change in biophysical and biochemical profile of these patients. Data from FSL-CGM showed significantly longer duration (101.9 ± 119.1 Vs. 45.9 ± 47.6 min, p < 0.033) and more frequent hypoglycemic episodes (4.4 ± 4.7 Vs. 2.3 ± 3.0, p < 0.047) during Ramadan compared tonon-Ramadan respectively. The mean blood glucose readings were also significantly lower (70.7 ± 29.3 Vs.93.7 ± 57.9 mg/dl p < 0.011) during Ramadan compared to non -fasting period. The renal function mean ± SD (serum creatinine 1.48 ± 0.37, 1.44 ± 0.37 and eGFR, 49.0 ± 18.4, 48.9 ± 17.5 p 0.9) showed no significant change due to fasting., Conclusion: In patients with diabetes and CKD-stage 3 Ramadan fasting under close supervision and optimal diabetes care, was not associated with worsening of HBA1c and renal function. Patients had significantly more frequent and prolonged hypoglycemic episodes during Ramadan., (Copyright © 2019 Elsevier B.V. All rights reserved.)

Aim: Most of Muslims patients with diabetes and Coronary Heart Disease (CHD) elect to fast in Ramadan, but the actual risk in this subset of patients with diabetes is largely unknown. We aimed to understand the safety of fasting in CHD patients with diabetes insisting on fasting Ramadan under optimal care. We also monitored the change in biophysical and biochemical parameters of these patients before and after Ramadan. We conducted this prospective study in a tertiary care hospital in Dubai during Ramadan 2016, (June 6th till July 5th)., Patients and Methods: 21 Patients with T2DM with stable known CHD during the three months prior to study and insisted on fasting despite advice against it were recruited for the study. All patients received continuous glucose monitoring with free style libre monitoring device (FSL-CGM) during and outside Ramadan period. We recorded DM or CVD-related emergency visit or hospitalisation, change in BMI, systolic and diastolic BP, lipids profile, e-GFR, HBA1c, and frequency of hypoglycemia during Ramadan fasting and not -fasting period., Results: This is first study using CGM in CHD patients with diabetes who observe fast in Ramadan. Patients had a significantly higher incidence (3.2 ± 2.8 vs 1.1 ± 1.6 episodes, p = 0.033) and prolonged duration of hypoglycemia (117.8 ± 87.2, 49.1 ± 59.1 min p 0.022) during fasting compared to non-fasting respectively. No significant alteration was seen in BMI, SBP and DBP, lipid profile and renal function. There is a significant improvement in HBA1c during Ramadan., Conclusion: We could not associate any adverse cardiovascular effects with fasting Ramadan in patients with stable CHD under optimal diabetes care. FSL-CGMS data showed higher frequency of hypoglycemia during Ramadan fasting. Studies with larger sample size are needed for further validation of these findings., (Copyright © 2019 Elsevier B.V. All rights reserved.)

Aim: We aimed at evaluating the safety of fasting Ramadan for insulin treated type 2 diabetes patients by assessing the biochemical, biometric parameters, flash glucose monitoring (FGM) data as compared to pre-Ramadan and hospital admissions with diabetes or non-diabetes conditions. The risks of fasting between those treated with basal insulin vs intensive insulin during Ramadan was also assessed., Methods: We included insulin treated patients with type 2 diabetes and we excluded those with co-morbidities. Patients were provided with Ramadan-focused education, FGM before and during Ramadan and medical advice for treatment adjustment. We measured biologic and biometric data before and after Ramadan., Results: HbA1c reduced from 7.9 ± 1.20 pre-Ramadan to 7.7 ± 1.5% post Ramadan (p = 0.023). Average peak glucose reading was 330.1 ± 79.8 mg/dl before Ramadan improved significantly to reach 289.3 ± 77.7 mg/dl (p = 0.013). Average number of hypoglycemic episodes was higher in intensive insulin group between 1200 and 1800 h (p = 0.028)., Conclusion: People with type 2 diabetes treated with insulin who fast Ramadan and who are provided with Ramadan focused patient education, individualized treatment adjustment and FGMS were not at increased safety risks as measured by biochemical, biometric and FGM data., (Copyright © 2019 Elsevier B.V. All rights reserved.)

Background: Physiology of intermittent and prolonged fasting is known from healthy subjects. Evidence on high and very high-risk groups is lacking. The anticipated risks include hypoglycemia, hyperglycemia, dehydration and thrombosis. Education, pre-Ramadan doses adjustment, and glucose monitoring devices (Optimum diabetes care in Ramadan) is expected to lower this risk., Aims: We aimed to assess the value of optimum care in diabetes management during Ramadan on the metabolic parameters of high risk patients with diabetes. Moreover, we wanted to assess and understand the safety of fasting in this group., Methods: This is a prospective interventional study. Patient with high-risk diabetes who insisted on fasting. High risk patients defined as any one with type 1 or type 2 diabetes on insulin, Gestational diabetes, stage 3 kidney disease, and having history of ischemic heart disease. All patients received a Freestyle Libre continuous glucose monitoring device, and was offered to attend the clinic at any time during the study, this collectively defined as optimum diabetes care during Ramadan. Biometric (Weight, height, Blood pressure) and biochemical (Glycosylated hemoglobin A, Lipids profile, creatinine, and estimated glomerular filtration rate) were reported within 4-6 weeks before and after Ramadan., Results: Total of 169 patients were. Majority were females 54.4% (n = 92). There was a remarkable improvement in glycemic control from 7.6 + 1.2 to 7.3 + 1.2 percent (p = 0.00). Serum creatinine showed a negligible change at the end of the study from 0.81 + 0.3 to 0.82 + 0.2 mg/dl). Only total cholesterol worsened significantly (p = 0.02)., (Copyright © 2019 Elsevier B.V. All rights reserved.)