Foods for digestion: what helps, and what to go easy on

There’s no single superfood for digestion, whatever the label on the kombucha says. What there is: a handful of everyday habits that the NHS recommends, and a few common triggers worth knowing about. The best foods for you depend on what you’re trying to fix.

What does a digestion-friendly diet look like?

The NHS’s advice on good foods for digestion boils down to five habits:

1. Fill up on fiber. Aim for 30g a day, from a variety of sources.
2. Drink plenty of fluids, especially water. Fiber absorbs water like a sponge, and without fluid it can’t do its job.
3. Cut down on fat. Fatty and fried foods are harder to digest.
4. Go easy on spice if it upsets your tummy.
5. Know your triggers, and keep a food diary to find them.

Which foods help with which problem?

This is where most “best foods” lists fall short: what helps constipation isn’t what helps heartburn. Here’s NHS advice by goal:

Your goal	Lean toward	Go easy on
Avoid constipation	Wholegrains, oats, fruit, veg, beans and pulses, plenty of water	Low-fiber processed foods
Avoid heartburn	Lean meat and fish, grilled food, non-fizzy, caffeine-free drinks	Fatty food, spice, garlic, onion, tomatoes, citrus, salad dressings, caffeine, fizzy drinks
Less bloating	Smaller meals, fiber from fruit and veg if grains bloat you	Fizzy drinks, and gassy foods like beans and cabbage if they bother you
IBS-friendly	Oats, up to 1 tablespoon of linseeds a day, regular meals	Wheat and onions may trigger symptoms; no more than 3 portions of fruit a day
Lactose intolerance	Smaller portions of dairy, or none (NHS lactose advice)	Milk and dairy, including cream, cheese, yogurt and chocolate

Which foods are hardest to digest?

The NHS says fatty foods, such as chips, burgers and fried foods, are harder to digest and can cause stomach pain and heartburn. Its tips:

• choose lean meat and fish
• drink skimmed or semi-skimmed milk
• grill rather than fry

Spicy food doesn’t bother everyone. If it gives you heartburn, stomach pain or diarrhea, go easy on it. If you already have heartburn or IBS, the NHS suggests avoiding it.

What should I drink?

Drink	NHS advice
Water	Helps waste pass and softens poo; have a glass with every meal
Herbal tea, milk	Good non-fizzy, caffeine-free options
Coffee, tea, cola	Caffeine boosts stomach acid and can cause heartburn; limit to 1 or 2 cups a day
Fizzy drinks	Tend to bloat the tummy, which can lead to heartburn

People with IBS are advised by the NHS to have at least 8 to 10 drinks of fluid a day (around 1.5 liters), and no more than 3 cups of tea or coffee.

Do probiotics help digestion?

The NHS says there’s some evidence they may help some conditions, including IBS, but little evidence for many other claims. Live yogurt is a natural source. If you want to try them:

• take them every day for at least 4 weeks
• talk to a doctor first if you have a health condition or a weakened immune system

What does it look like in a log?

Mon 19:30  Meal: fried chicken, chips  tags: fatty
Paper note: heartburn at 21:00
Tue 08:30  Poop: Type 5
Wed 19:00  Meal: grilled fish, new potatoes, peas
Thu 08:10  Poop: Type 4
Fri 13:00  Meal: tomato pasta, cola  tags: acidic, caffeine
Paper note: heartburn again

Two heartburn evenings, both after foods on the NHS trigger list. The grilled meal in the middle went fine. That’s a pattern you can act on.

Myths vs facts

Myth	Fact
One superfood fixes digestion	NHS advice is about overall habits: fiber, fluids, less fat.
Spicy food is bad for everyone	Many people are fine; go easy if it bothers you (NHS).
Whole grains suit everyone	Get fiber from fruit and veg if grains bloat you (NHS).
Probiotics help everyone	Evidence is limited outside some conditions like IBS (NHS).

Digestion-friendly basics

• Aim for 30g of fiber a day, added slowly
• Drink a glass of water with every meal
• Grill instead of fry
• Limit coffee and tea to 1 or 2 cups if you get heartburn
• Swap fizzy drinks for water or herbal tea
• Keep a food diary to find your triggers

When should I see a GP?

Food changes help with everyday comfort. They aren’t a fix for ongoing problems. See a GP if symptoms keep coming back, don’t improve with diet changes or come with blood in your poop or weight loss you can’t explain. Don’t cut out whole food groups without advice from a GP or dietitian.

Where does PoopAI fit?

PoopAI logs meals by photo or text with trigger tags like fatty or caffeine, and each poop as Bristol type 1 to 7. Weekly reports and trend charts show which foods come before your better and worse days. Heartburn and other symptoms aren’t logged in the app, so keep a quick paper note.

The bottom line

Fiber, fluids, less fat, and knowing your own triggers. Pick foods for the problem you’re trying to solve, change one thing at a time, and let a food log show you what works. Next: how much fiber you need.

Editorial note: Written by The FixMyGut team using the NHS and NIDDK sources listed below. It’s general information, not a diagnosis. Facts checked against those sources on November 5, 2026.