🦠 Gut Health Habits Score

No home quiz can sequence your microbiome, but habits predict its diversity well: this 10-question checklist scores fiber diversity, fermented foods, activity, sleep, and antibiotic stewardship out of 30, with 19+ marking a gut-friendly routine. Answer for your score, then read what the science actually supports.

How to Take This Check

Each question targets a habit with real microbiome evidence behind it. This is educational, not diagnostic: it cannot detect dysbiosis, SIBO, or any disease.

What the Questions Are Based On

The American Gut Project found that people eating 30+ different plant types weekly had markedly more diverse microbiomes than those under 10, regardless of vegan or omnivore status: variety beats ideology. A 2021 Stanford trial showed fermented foods increased microbiome diversity and calmed inflammatory markers, while fiber alone acted differently (more fiber, different mechanism). Exercise, sleep, and stress each modulate the gut independently in human studies. Antibiotics are the clearest disruptor: broad-spectrum courses can suppress diversity for months, which is why stewardship (not avoidance when needed) is the question. Artificial sweeteners and emulsifiers have signals of microbiome disruption in trials; ultra-processed diets starve beneficial bacteria of fiber while feeding less helpful species.

Worked Example

Answers: 15 plant types (1), fermented foods weekly (2), fiber ~20 g (1), ultra-processed a few times weekly (1), sweeteners often (1), moderate activity (2), 6-7 h sleep (1), one antibiotic course (2), stress somewhat managed (1), 2-3 veg servings (1). Total: 13, mixed picture. The levers: plant diversity (30+ types adds 2), daily fermented food (+1), fiber to 30 g (+1), cutting sweeteners (+2): realistic month, new total ~19, gut-friendly routine. I verified the calculator sums identically. Note what changed: all diet, because diet dominates the score the way it dominates the evidence.

What Actually Moves the Needle

The probiotic row surprises people: for healthy individuals, most commercial probiotics show transient colonization and inconsistent benefit; they shine in specific indications (antibiotic-associated diarrhea, some IBS, pouchitis). Food-first beats bottle-first for the general case. For the fiber math, our fiber calculator sets your gram target, our fat intake calculator balances the macros, and our sleep debt calculator covers the sleep lever.

When Gut Symptoms Need a Clinician

This checklist is for habits, not symptoms. Red flags that need medical evaluation: blood in stool, unintentional weight loss, persistent change in bowel habits, nighttime symptoms waking you, iron deficiency anemia, or a family history of colorectal cancer or IBD. IBS-style symptoms (pain related to defecation, bloating, altered habits) deserve a clinician's assessment, not a probiotic guess. Celiac disease must be excluded with serology while still eating gluten. The microbiome field is exciting but young: anyone selling you a diagnosis from a quiz or a supplement from a stool kit is ahead of the evidence.

Building the 30-Plant Week

Thirty sounds daunting until you count properly: every vegetable, fruit, legume, grain, nut, seed, herb, and spice counts. A day with oatmeal (oats, berries, flax, walnuts = 4), lentil soup (lentils, carrots, onion, celery, cumin, turmeric = 6 more), and a mixed salad (lettuce, tomato, cucumber, chickpeas, olive oil, lemon = 6 more) reaches 16 before dinner variety. Frozen counts, canned counts, herbs count. Diversity, not exoticism: rotating the same five vegetables more creatively beats hunting rare ones.

The Fiber Gap: America's 95% Problem

Ninety-five percent of Americans miss the recommended fiber intake (25 g women, 38 g men), averaging around 15 g: the single biggest reason gut scores cluster low. Closing the gap is unglamorous but effective: a half-cup of lentils adds 8 g, an apple 4-5 g, a quarter-cup of almonds 4 g, and a cup of raspberries 8 g. Increase gradually (5 g per week) with extra water, because a sudden jump causes the gas and bloating that make people quit. The gas itself is informative: it means bacteria are fermenting the fiber into short-chain fatty acids like butyrate, which feed colon cells and calm inflammation. Persistent intolerance of even gradual increases, especially with pain or altered habits, deserves medical evaluation rather than more fiber. For most people, though, the barrier is not tolerance but routine: the same breakfast and lunch daily, rebuilt once around fiber, quietly adds 10-15 g forever.

For informational purposes only, not medical advice. Consult a healthcare professional.