How to track your gut at home

Dr Chad OkayFounder, Suna Health

4 min read. Updated .

You can build a useful gut snapshot at home in 2 weeks with no kit. Track 6 things daily: stool form (Bristol scale), bowel frequency, transit time (corn test once), bloat and pain, fibre and fermented food intake, and sleep duration. The patterns that emerge tell you more than most consumer microbiome tests, and they cost nothing.

Most expensive gut tests give you a stack of data and no clear next step. Cheap home tracking gives you fewer numbers but each one tells you what to change. Here's a practical 2-week protocol that works.

What to track each day

  1. Stool form: Bristol stool chart types 1-7. Type 3-4 is the healthy zone.
  2. Bowel movements per day. 1-3 is normal. Less than 3 a week is constipation territory; more than 3 a day is diarrhoea territory.
  3. Bloat: 0 (none) to 10 (maximum), measured at three points, waking, 6pm, bedtime.
  4. Fibre: rough grams. 30 g per day is the UK target for adults (NHS / SACN).
  5. Fermented food: yes/no. Yoghurt, kefir, kimchi, sauerkraut, miso, kombucha, sourdough.
  6. Sleep: hours and quality (rested vs tired).

The corn test (do it once)

Eat a portion of sweetcorn at lunch on day 1. Note the time. Watch your stool. Note when you first see corn kernels, this is your gut transit time. The healthy range is wide: wireless-capsule studies put normal whole-gut transit at roughly 10 to 73 hours, with the median around 28. Faster than that often means loose stools; slower often means constipation. The corn test is a rough relative marker, not a precise reading.

Patterns to watch for

Healthy

  • Bristol type 3-4 most days.
  • 1-2 movements daily.
  • Bloat under 3 most evenings.
  • Fibre at or near target.
  • Fermented food 4+ times a week.
  • Transit time 24-36 hours.
  • Sleep 7+ hours.

The slow gut pattern

  • Bristol type 1-2 (hard, lumpy).
  • Fewer than 3 movements per week.
  • Transit time over 60 hours.
  • Bloat builds through the day.
  • Often paired with low fibre or low water intake.

The fast, sensitive gut pattern

  • Bristol type 5-7 (loose, watery).
  • Multiple movements daily, often urgent.
  • Transit time under 12 hours.
  • Strong bloat after specific meals.
  • Often paired with stress or specific FODMAP foods.

Cycle-driven pattern (women)

  • Bloat correlates with cycle day, not food.
  • Constipation in the luteal phase, sometimes loose stools at the start of bleeding.
  • Pattern repeats month after month.
  • Track menstrual cycle alongside the gut data.

What to do with the patterns

  1. Slow gut pattern: add 5 g of fibre per day for a week, drink plenty of water, walk 30 minutes daily. If diet and movement aren't shifting it, a pharmacist can talk you through the over-the-counter options that actually have evidence behind them.
  2. Fast, sensitive gut: try a low-FODMAP elimination under a dietitian. If loose stools dominate the picture, that pattern has explanations of its own and is worth taking to your doctor.
  3. Bloat builds through the day: stop eating 3 hours before bed, walk after meals, check evening sodium.
  4. Bloat correlates with cycle: see the luteal-phase bloating guide. Adjust week-by-week instead of daily.
  5. Sleep under 7 hours and gut symptoms worse: prioritise sleep first. Many gut issues are downstream of sleep debt.

When home tracking isn't enough

  • Blood in your stool, or stools that look black and tarry. That one is same-day territory, not two-week-tracking territory.
  • A persistent change in bowel habit that doesn't settle (especially over 50).
  • Unexplained weight loss alongside gut changes.
  • Pain that wakes you at night.
  • Family history of bowel cancer or inflammatory bowel disease.
  • A routine blood test showing low iron.

Common questions

Should I get a microbiome test alongside this?
Not as a first step. Most consumer microbiome tests give you data without clear actions. Home tracking gives you fewer data points but each one connects to a specific change. If you're going to do a microbiome test, do it after 4-6 weeks of home tracking so you have a baseline to compare against.
Is the corn test really accurate?
Useful as a relative tracker, not a diagnostic. There is no published study validating the corn test against the SmartPill wireless motility capsule (the FDA-approved gold standard for transit measurement). Whole-gut transit varies widely between healthy adults, published SmartPill studies show normal values from under 24 hours to over 70 hours. Repeat the corn test a few times, watch your own pattern, and treat it as your baseline rather than a clinical reading.
How long until I see patterns?
Two weeks is the minimum. Three weeks is better, it covers most of a menstrual cycle. Most patterns don't show up in a single week because of natural day-to-day variation.
Do I need an app?
No. A notes app, a spreadsheet, or even a paper notebook works. Gut tracking apps (Cara Care, Bowelle, MyHealthExplained) help if you want graphs, but they aren't doing anything you can't do manually.

Sources

Written by Dr Chad Okay. Contributor: Dr Parisah Hussain, MBChB, BSc (Hons), DRCOG, MRCGP. Last updated 15 September 2026. From Digests.

Digests explains how the body works in general, everyday terms. It is not medical advice. It is not a substitute for someone who can examine you and knows your history, and we do not tell you what dose of any medicine to take.

Where we describe how something is checked or looked after, we follow UK guidance from NICE and the NHS. If you are reading this outside the UK, the same concerns are worth taking to your own doctor, though the tests and routes where you live may differ.

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