The short answer: Evidence-based dietary guidelines have moved away from blanket "eat more fibre" advice for constipation. Specific interventions — a measured psyllium supplement, kiwifruit, certain probiotic strains, magnesium — have better supporting evidence than simply piling on more roughage.

Why is "eat more fibre" bad advice?

It's not that fibre is unhelpful. It's that "more fibre" is too vague to be useful, and for a meaningful group of people it backfires.

Fibre isn't one substance. Insoluble fibre — wheat bran, tough vegetable skins — adds bulk. Soluble, gel-forming fibre like psyllium holds water and softens stool. Rapidly fermentable fibres feed gut bacteria and produce gas as a by-product. If your problem is hard, slow-moving stool and you respond by loading up on bran and beans, a common result is more bloating, more discomfort, and no improvement in going.

The British Dietetic Association's dietary guidelines for chronic constipation reflect this shift. Rather than a general high-fibre push, the emphasis falls on named interventions with specific evidence behind them.

What does the evidence actually support?

Psyllium, at a real dose. Guidance points toward at least around 10g a day of a supplemental fibre such as psyllium, which is considerably more than most people take when they sprinkle a spoonful into something. It works by forming a gel that holds water in the stool. Two things matter: build up gradually, and drink enough water with it — psyllium without adequate fluid can make matters worse.

Kiwifruit. This one surprises people. Randomised trials and a systematic review have found two kiwifruit daily to be about as effective as psyllium for softening stool and reducing straining, and in some comparisons better for increasing stool frequency. Two whole fruit a day is a low-risk thing to test on yourself for a fortnight.

Certain probiotic strains. The evidence is strain-specific rather than general, which explains why results vary so much between products and between people. Some strains show benefit for stool frequency and consistency; others show none. If you'd like to try this route, our Daily Pre+Probiotic Melts pair live cultures with prebiotic fibre in a format that survives a handbag in Singapore heat better than a refrigerated capsule does. Give any probiotic four weeks before judging it.

Magnesium. Certain magnesium salts draw water into the bowel. This is a real, well-understood effect — which also means it's easy to overshoot into urgency, so start low.

Adequate fluid. Not a cure by itself, but every fibre strategy above depends on it. In our climate, plenty of people are running a persistent small deficit without realising. If plain water is a struggle, Hydrate+ Electrolyte Hydration Tablets make it easier to actually finish the bottle.

What else matters that isn't food?

Movement. Regular physical activity supports gut motility. It doesn't need to be exercise in the gym sense — walking counts.

Not ignoring the urge. Repeatedly overriding the signal because you're in a meeting trains the reflex down over time. This is genuinely one of the more underrated factors.

Position and unhurried time. A footstool that raises the knees above the hips changes the anorectal angle and makes things mechanically easier. So does not rushing.

Consistent meal timing. The gastrocolic reflex — the urge that follows eating — is more reliable when meals are regular. Breakfast in particular tends to trigger it.

Frequently asked questions

How much of a change is "normal"? There's a wide healthy range, roughly three times a day to three times a week. What matters more than the number is whether it's comfortable, whether it's changed from your own baseline, and whether you're straining.

Are laxatives bad for you? Occasional use of the gentler types is generally considered reasonable. The concern is with long-term reliance on stimulant laxatives without ever addressing the underlying pattern — and with using them to mask a symptom that needs investigating. Worth a pharmacist or doctor conversation rather than an indefinite habit.

When should I see a doctor? Please don't sit on this one. New and persistent change in bowel habit, blood in the stool, unexplained weight loss, ongoing pain, or constipation that starts suddenly and doesn't settle all warrant medical review rather than another supplement.

This article is general education, not medical advice — please speak with your doctor about persistent or new digestive symptoms.