Gut & Digestive Health

02

What actually helps, and what's mostly myth?

“Eat more fibre” is not, by itself, reliable advice for a bloated or irregular gut, the type of fibre matters. UK clinical guidance (NICE) specifically advises being cautious with insoluble fibre such as bran, wholemeal flour, and whole grains, since it can worsen symptoms in irritable bowel syndrome, while soluble fibre, oats, and foods like ispaghula, is better tolerated when more fibre is genuinely needed.

The same guidance recommends regular meals rather than skipped or delayed ones, at least eight cups of fluid a day (mostly water), and capping tea and coffee at around three cups a day. None of this is dramatic, and that is largely the point: consistency tends to outperform elimination as a first move.

There is also real, if still early, evidence for fermented foods specifically. A 2021 randomized trial at Stanford put healthy adults on either a high-fibre diet or a diet rich in fermented foods (yoghurt, kefir, kimchi, fermented vegetables) for ten weeks. The fermented-food group showed a steady increase in gut microbiome diversity and a drop in 19 inflammatory markers, including interleukin-6, effects the high-fibre-only group did not show over the same period. It is one trial in generally healthy adults, not a treatment protocol for a diagnosed condition, but it is a genuine, different mechanism from simply eating more fibre.

03

Why does a low-FODMAP diet need a dietitian, not a phone app?

Because it is a structured three-phase process, restriction, reintroduction, personalisation, not a permanent list of banned foods, and skipping the reintroduction phase is the single most common way it turns into unnecessary long-term restriction. The British Dietetic Association positions it as a second-line strategy, used once the everyday changes above have not resolved symptoms, and notes it is most effective when led by a dietitian who can guide suitable substitutions during restriction and structure the reintroduction properly.

Done without that structure, the risk is not just inconvenience, it is cutting out entire food groups indefinitely, with real potential for nutrient gaps, for a benefit that was only ever meant to be diagnostic and temporary.

04

When does this need a doctor before a dietitian?

Before symptoms are treated as IBS or a general gut issue, NICE guidance sets out specific signs that warrant medical referral rather than dietary management: unintentional and unexplained weight loss, rectal bleeding, a change in bowel habit to looser or more frequent stools lasting more than six weeks in someone over 60, a family history of bowel or ovarian cancer, anaemia, or an abdominal or rectal mass.

If any of that applies, the next step is a doctor, not a food plan. Nutrition support is for after those have been checked and ruled out, working alongside a diagnosis rather than in place of one.