To treat digestive problems in elderly people, thyme, oregano, and chamomile will be beneficial. In addition, the Prophet ﷺ recommended fennel to us; indeed, fennel seeds work very well for digestive imbalances, diarrhea, constipation, or even kidney problems. It is very wise to know the benefits of fennel, which can be used from birth to a much more advanced age.
As for chamomile, ginger, thyme, and oregano, they will be very helpful for digestive problems as well as gas caused by harmful bacteria.
However, if the problems persist, it will then be necessary to make sure that the cause does not come from a medication with undesirable side effects, from a sedentary lifestyle, or from poor dietary habits. Eating white bread, a lack of fiber intake, a diet too high in fat, or eating meals late at night can be the cause of all these troubles; it will therefore be essential to improve one's lifestyle, and even to avoid certain harmful foods altogether.
What the science says: medicinal plants, irritable bowel syndrome, and bloating
Here is what published research says about the remedies mentioned above, for context — these studies address material causes; healing belongs to Allah.
Medicinal plants: using them properly
Moringa, for example, has shown an effect on blood sugar according to a meta-analysis (Molecules, 2021) and its safety has been reviewed (Phytother Res, 2015); more generally, plants act — and therefore interact: the review of plants against anxiety (Pharmacol Res, 2022) or against painful periods (J Int Med Res, 2020) is a reminder of this. Precaution: respect the dosages, avoid mixing many plants together, check compatibility with your medications, pregnancy, or breastfeeding; buy quality plants from a controlled source.
Irritable bowel syndrome and bloating
Peppermint essential oil in enteric-coated capsules relieves irritable bowel syndrome according to meta-analyses (Aliment Pharmacol Ther, 2022) (J Clin Gastroenterol, 2014); soluble fiber (psyllium) and probiotics have also proven effective (Lancet Gastroenterol Hepatol, 2020) (Gastroenterology, 2023). Fennel, anise, cumin, and activated charcoal reduce gas. Precaution: take charcoal away from medications (it absorbs them); blood in the stool, weight loss, or nighttime pain call for a medical checkup.