What should you know about soluble fiber for constipation?

Soluble fibre absorbs water in the digestive tract and forms a softer, gel-like stool that can be easier to pass. It is found in foods such as oats, beans, lentils, fruit and some vegetables. A sudden large increase may cause bloating, wind or abdominal discomfort, particularly if your usual diet contains little fibre.

Constipation can involve hard stools, straining, infrequent bowel movements or a sense that the bowel has not emptied. It may relate to diet, low fluid intake, reduced movement, medicines or another condition. Soluble fibre may help, but it is not suitable to treat every new or persistent bowel change without assessment.

Increase fibre in small steps, choose a mixture of whole foods, and drink regularly unless a clinician has advised you to limit fluids. Gentle walking and responding to the urge to open your bowels can also help. Keep track of stool texture, discomfort and any foods that make symptoms worse.

If food changes are difficult, a pharmacist or nutrition counsellor can discuss a suitable fibre product and how to take it. Separate fibre supplements from some medicines when advised, because fibre may affect how medicines are absorbed.

Seek urgent help for severe or worsening abdominal pain, repeated vomiting, a swollen abdomen, inability to pass stool or gas, or blood in the stool. Arrange a medical review for persistent constipation, an unexplained change in bowel habit, weight loss, or symptoms that began after a new medicine. Do not keep adding fibre if it clearly worsens pain or bloating.

Ask how much fibre is appropriate for your symptoms, whether your medicines could be contributing, and whether your thyroid or bowel health needs checking. Tell the clinician about fluid intake, stool changes, pain, bleeding and how long the problem has been present.