Irritable bowel syndrome (IBS) is a chronic, and surprisingly common, digestive condition – affecting an estimated 15% or more of people in the developed world.
Symptoms vary significantly from person to person, both in type and intensity. Some people experience more constipation, others more diarrhoea, and many notice increased anxiety around travel. IBS has been linked to various other factors, including stress, bacterial infection and food sensitivities, though the exact underlying cause remains unclear.
There's currently no cure for IBS, but symptoms can often be managed through a combination of medication, stress management, and dietary changes – typically a diet lower in certain carbohydrates and higher in fibre. Probiotic-rich foods like live yoghurt can also be genuinely helpful for some people.
Vitamins and Minerals
Supplements can play a supporting role alongside dietary changes. Here are the key vitamins and minerals worth understanding if you have IBS:
Vitamin D
Vitamin D helps regulate inflammation and supports the gut microbes involved in healthy digestion. Some research suggests IBS sufferers are more likely to be deficient in vitamin D, and this deficiency may play a role in symptoms for some people. Supplementing is particularly worth considering during autumn and winter, when lower sunlight levels reduce the body's natural vitamin D production.
Zinc
Zinc supports several biological processes, including immune function, which can indirectly help manage IBS symptoms. It's generally best absorbed in liquid or well-formulated tablet form.
Calcium and Magnesium
Calcium can support bowel health and help ease some IBS symptoms, but the specific form matters. If constipation is your main symptom, **calcium citrate** supplements (which typically include magnesium, known for its mild stimulating effect on the bowel) may be more helpful.
If diarrhoea is more of an issue, **calcium carbonate** supplements, which don't contain magnesium, are usually the better choice. Pairing calcium with vitamin D can also improve absorption.
One nutrient worth being cautious with is vitamin C. While important for general health, higher doses can cause gas, bloating, and a laxative effect that may worsen diarrhoea-predominant IBS. Many multivitamins contain higher levels of vitamin C than expected, so it's worth checking labels – getting vitamin C from colourful fruit and vegetables is generally a gentler approach for IBS sufferers.
Iron supplements are also worth approaching with caution, since excess iron can contribute to stomach upset and constipation.
IBS symptoms and triggers are highly individual, which is exactly why identifying your own specific patterns matters more than following generic advice. A food intolerance test can help uncover any food sensitivities that might be contributing to your symptoms, giving you a clearer, more personalised basis for managing your diet. Check My Body Health offers a full range of affordable, mail-in nutrition and health tests, including food intolerance tests for individuals, couples and families.
