For digestive transit problems, it is recommended to eat vegetable soups, or grain-based dishes like oatmeal or talbina.
When breaking the fast, start with dates, then drink water, and half an hour after the prayer have a vegetable or grain soup.
What the science says: fasting, fiber, and digestion
Here is what published research says about the remedies mentioned above, for context — these studies address material causes, while healing belongs to Allah.
Fasting
Fasting, prescribed and then recommended by the Sunnah (Monday-Thursday, the white days), is now studied under the name of intermittent fasting: a meta-analysis in the BMJ shows favorable effects on weight and cardiometabolic risk factors (BMJ, 2025), with an impact on appetite (Nutrients, 2023) and body composition (Diabetes Obes Metab, 2024). Precaution: people on insulin for diabetes, pregnant or breastfeeding women, or those in a weakened state should adjust their fasting with their doctor — Islam permits, and sometimes requires, not fasting in case of illness.
Fiber and digestion
A meta-analysis in the American Journal of Clinical Nutrition confirms that fiber supplementation improves stool frequency and chronic constipation in adults (Am J Clin Nutr, 2022); in children, non-drug approaches are validated (J Pediatr, 2022). Vegetables, whole fruits, legumes, barley, flaxseed, and psyllium are good sources. Precaution: increase intake gradually and drink more water — fiber without water worsens constipation; avoid enemas and purges without medical advice (Am J Gastroenterol, 2009).
