Effect of fasting on 24-h blood pressure values of individuals with no previous history of hypertension

The effect of observing religious or faith-based fasting on cardiovascular disease risk factors: A systematic review and meta-analysis

AIMS

Cardiovascular diseases (CVD) are the leading cause of death worldwide. Fasting is common in many religions and is associated with health benefits. This systematic review to compares the impact of different religious fasting practices, on risk of cardiometabolic diseases.

DATA SYNTHESIS

The search covered five databases following PRISMA guidelines to identify papers published in English from inception to March 2023 (updated January 2024). Inclusion criteria were healthy adults in observational studies, who engaged in religious fasting practices, studies were included where data on matched non-fasting individuals was available. Outcomes were systolic and diastolic blood pressure, body mass index (BMI), triglycerides, total cholesterol (TC), low-density lipoprotein cholesterol (LDLc), high-density lipoprotein cholesterol (HDLc), and fasting plasma glucose levels. A meta-analysis was conducted, and the review was registered (CRD42022352197). Fourteen studies were met the inclusion criteria with ten studies data being suitable for meta-analysis, reporting on 755 adults participating in fasting practices and 661 non-fasting controls. Religious fasting was associated with a reduction in BMI (-0.40 kg/m2, 95% CI [-0.70, -0.10], p < 0.01). Observance of Ramadan fasting was associated with decreased systolic blood pressure (-3.83  mmHg, 95% CI [-7.44, -0.23], p = 0.04). The observance of Orthodox Christian fasting was associated with a reduction in TC (-0.52 mmoL/l, 95%CI [-0.64, -0.39], p < 0.01). No difference was found for the other outcomes.

CONCLUSION

This review found religious fasting practices which were associated with a reduction in some biomarkers of cardiometabolic diseases risk. Further research on other fasting practices is needed due to limited data.

Blood pressure evaluated by 24 h ambulatory blood pressure monitoring in Ramadan-fasting patients with corticotrope deficiency

PURPOSE

The risks of Ramadan fasting on blood pressure (BP) in patients with adrenal insufficiency are unknown. This study aimed to evaluate the levels of BP and particularly the risk for hypotension during a fasting day compared with a nonfasting day in patients with corticotrope deficiency.

METHODS

A prospective case-crossover study on 28 patients with known and treated corticotrope deficiency who were fasting the month of Ramadan. Clinical (eating and sleeping habits, abnormal symptoms, weight, height, and BP) and paraclinical (creatinine, sodium, and cortisol) data were collected. Patients had a 24 h ambulatory BP monitoring during a Ramadan fasting day then again during a nonfasting day.

RESULTS

The data of 25 patients were analyzed; 20 women, median age: 40 years (IQR, 22.5-45.5), median duration of the disease: 6 years (IQR, 2.5-12). The prevalence of hypotension did not differ between the fasting day and the nonfasting day. Hour by hour BP levels comparison showed that both systolic and diastolic BP were significantly lower at 2.00 p.m. during fasting. BP variability was significantly lower during the fasting period compared with the same period during the nonfasting day.

CONCLUSIONS

Fasting was not associated with an increased risk for hypotension in patients with known and treated corticotrope deficiency.