Gut Health and Diet: Everyday Habits for Better Digestion (UK Guide)
Quick answer: For most adults, good gut health and better everyday digestion come from steady habits rather than special products. Build meals around the NHS Eatwell Guide, work up gradually to 30 g of fibre a day, drink 6 to 8 glasses of fluid, enjoy fermented foods if they suit you, and eat regular meals, leaving 3 to 4 hours before bed.
- Start with the Eatwell Guide: fruit and vegetables, and starchy foods, each make up just over a third.
- Aim for 30 g of fibre a day. Most UK adults get about 20 g, so increase it gradually.
- Drink 6 to 8 glasses of fluid. Fibre needs water to do its job.
- Fermented foods are optional extras; the evidence is still developing.
- Timing matters. Smaller, regular meals and an earlier evening meal suit many people.
01What does “gut health” mean?
“Gut health” isn’t a medical term. In everyday use, it usually means a digestive system that works comfortably: regular, easy bowel movements, without frequent bloating, heartburn or tummy pain.
Your gut is also home to trillions of microorganisms, the gut microbiota. The British Dietetic Association (BDA) explains that fibre is broken down by bacteria in the large intestine, one reason diet and gut bacteria are closely linked.
| Fibre target (adults) | 30 g a day (UK government guidelines) |
|---|---|
| Average adult intake | About 20 g a day (NHS) |
| Fluids | 6 to 8 cups or glasses a day, more if hot, active or unwell |
| Fruit and vegetables | At least 5 portions a day; just over a third of what you eat |
| “High fibre” on a label | At least 6 g of fibre per 100 g |
02A gut health diet starts with the NHS Eatwell Guide
The Eatwell Guide is the UK’s official model of a balanced diet, and a sensible base for gut health. You don’t need to hit it at every meal; aim to get the balance right over a day or a week.
| Fruit and vegetables | Just over a third of your food; at least 5 portions a day, fresh, frozen, tinned or dried. |
|---|---|
| Starchy foods | Just over a third of your food; choose wholegrain or higher-fibre versions. |
| Beans, pulses, fish, eggs and meat | Pulses are low in fat and a good source of fibre. Aim for 2 portions of fish a week, 1 oily. |
| Dairy and alternatives | Choose lower-fat and lower-sugar options, such as plain low-fat yoghurt. |
| Oils and spreads | Unsaturated types, in small amounts. |
| Foods high in fat, salt and sugar | Outside the main guide: less often and in small amounts. |
The guide doesn’t apply to children under 2. If you have medical or special dietary needs, a registered dietitian can help you adapt it.
03Fibre and gut health: the 30 g target
Government guidelines say adults should aim for 30 g of fibre a day, yet most adults eat about 20 g. The NHS links eating plenty of fibre with a lower risk of heart disease, stroke, type 2 diabetes and bowel cancer, and says fibre helps keep digestion regular and can help with constipation. When it comes to gut health, fibre is one of the most useful places to start.
Here is how the NHS builds a day to about 30 g:
| Breakfast · about 8.3 g | 2 slices of wholemeal toast with peanut butter, and a medium orange |
|---|---|
| Lunch · about 11 g | Wholemeal spaghetti with a lentil and tomato sauce |
| Dinner · about 11.2 g | Grilled chicken breast, skin-on baked potato, carrots and green beans |
04Fermented foods and probiotics
Fermented foods, such as yoghurt, kefir, sauerkraut, kimchi and kombucha, are made with the help of microorganisms and are often discussed in relation to gut health.
- Probiotic foods: the BDA suggests choosing yoghurts labelled “contains live or active cultures”.
- Not every fermented food is a probiotic. The BDA says kefir and kombucha are not considered probiotics, because of a lack of evidence.
- Prebiotics feed your own gut bacteria. Sources include onions, garlic, asparagus, artichoke and chicory root.
Wastyk et al. (2021): fibre or fermented foods?
- Cell
- 36 healthy adults
- 10-week diet phase
In this small Stanford study, adults increased either fibre or fermented foods. The fermented-food group showed a steady rise in the diversity of their gut bacteria and lower levels of several inflammation-related markers in the blood; some reported more bloating early on. With no control group and 18 people per arm, more research is needed.
Supplements are a separate question. The NHS says there is some evidence that probiotics may help with some conditions, but little evidence for many other claims. If you have a health condition or a weakened immune system, talk to a doctor before trying them.
05Hydration
Fluids matter for gut health too. The Eatwell Guide recommends 6 to 8 cups or glasses of fluid a day, and the NHS suggests drinking enough for your pee to be a clear pale yellow. Water, lower-fat milk, sugar-free drinks, tea and coffee all count.
As the NHS puts it, fibre acts like a sponge: without enough fluid, it can’t do its job. A glass of water with every meal is an easy habit, and if caffeine or fizzy drinks bring on heartburn or bloating, try water, milk or herbal teas.
Fibre and fluids work as a pair. More of one usually means you need more of the other.
06Meal timing and eating habits
How and when you eat matters for gut health too. NHS pages suggest these habits for common digestive niggles:
| Bloating | Eat smaller, more frequent meals; chew with your mouth closed; avoid large meals late at night; exercise regularly |
|---|---|
| Indigestion and heartburn | Don’t eat 3 to 4 hours before bed; cut down on rich, spicy or fatty foods, caffeine and alcohol |
| Constipation | Increase fibre gradually, drink plenty of fluids, keep a regular toilet routine and stay active |
| Unclear triggers | Keep a food diary to spot which foods and drinks bring on symptoms |
Not smoking, cutting down on alcohol and managing stress, which the NHS lists as a cause of indigestion, help too.
07When to see your GP
Gut health habits are not a substitute for getting symptoms checked, and a GP can refer you to an NHS dietitian. Related reading: H. pylori in the UK, what NAC is and Pylopass™ explained.
08Frequently asked questions
What is the best diet for gut health?
There is no single best diet. For most adults, the NHS Eatwell Guide is a good base: plenty of fruit and vegetables, wholegrain starchy foods and pulses, with fewer foods high in fat, salt and sugar. Aim for 30 g of fibre and 6 to 8 glasses of fluid a day.
How much fibre should I eat a day?
UK guidelines recommend 30 g a day for adults. Children need less: about 15 g at 2 to 5 years, 20 g at 5 to 11 years and 25 g at 11 to 16 years. Increase fibre gradually and drink plenty of fluids to avoid bloating and wind.
Are fermented foods good for gut health?
They can be part of a varied diet, but the evidence is still developing. A small 2021 study found that eating more fermented foods increased the diversity of gut bacteria. Start slowly, as some people notice more bloating at first.
How much water should I drink for good digestion?
The Eatwell Guide recommends 6 to 8 cups or glasses of fluid a day, more if it’s hot, you’re active or you’re unwell. Water, lower-fat milk, sugar-free drinks, tea and coffee all count.
Does meal timing affect digestion?
It can. For indigestion, the NHS suggests not eating 3 to 4 hours before bed. For bloating, it suggests smaller, more frequent meals rather than large ones, and avoiding large meals late at night.
When should I see a GP about digestive symptoms?
See a GP if you have changes in your poo that aren’t usual for you, regular bloating, indigestion that keeps coming back, or weight loss without trying. Get urgent help if your poo is black or bloody, or if you are vomiting blood.
09About London Health Star
London Health Star is a UK company that makes food supplements. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.
Explore StarBiome Pylori, a food supplement with Pylopass™, NAC, chamomile and vitamin B12. Each daily dose of 2 vegan capsules contains:
- Pylopass™ (Lactobacillus reuteri DSM 17648, inactivated)200 mg
- N-acetyl cysteine (NAC)600 mg
- Chamomile extract37.5 mg
- Vitamin B12 (as methylcobalamin)25 µg (1000% NRV)
Vitamin B12 contributes to the reduction of tiredness and fatigue, to normal energy-yielding metabolism and to the normal function of the immune system.
10Sources
Disclaimer: this guide is for general information only and does not replace advice from your GP, pharmacist or a registered dietitian.
- NHS. The Eatwell Guide. https://www.nhs.uk/live-well/eat-well/food-guidelines-and-food-labels/the-eatwell-guide/
- Office for Health Improvement and Disparities (GOV.UK). The Eatwell Guide. https://www.gov.uk/government/publications/the-eatwell-guide
- NHS. How to get more fibre into your diet. https://www.nhs.uk/live-well/eat-well/digestive-health/how-to-get-more-fibre-into-your-diet/
- NHS. Good foods to help your digestion. https://www.nhs.uk/live-well/eat-well/digestive-health/good-foods-to-help-your-digestion/
- NHS. Water, drinks and hydration. https://www.nhs.uk/live-well/eat-well/food-guidelines-and-food-labels/water-drinks-nutrition/
- NHS. Bloating. https://www.nhs.uk/conditions/bloating/
- NHS. Constipation. https://www.nhs.uk/conditions/constipation/
- NHS. Indigestion. https://www.nhs.uk/conditions/indigestion/
- NHS. Symptoms of bowel cancer. https://www.nhs.uk/conditions/bowel-cancer/symptoms/
- British Dietetic Association. Fibre: food fact sheet. https://www.bda.uk.com/resource/fibre.html
- British Dietetic Association. Probiotics and gut health: food fact sheet. https://www.bda.uk.com/resource/probiotics.html
- Wastyk HC, Fragiadakis GK, Perelman D, et al. Gut-microbiota-targeted diets modulate human immune status. Cell. 2021;184(16):4137–4153. https://pmc.ncbi.nlm.nih.gov/articles/PMC9020749/
