Consistency matters more than any single dramatic intervention — here's how the evidence above translates into an actual weekly routine.
The Weekly Structure
| Habit | Target | Evidence tier |
|---|---|---|
| Fermented foods | 2–4 servings daily | Strong — controlled trial evidence for diversity and inflammation |
| Plant diversity | 30+ different plants per week | Moderate-strong — large-scale citizen-science association |
| Prebiotic fibre | Regularly, alongside diverse plants | Reasonable mechanistic support, complements the above |
| Probiotic supplements | Not a default recommendation | Weak for durable microbiome change in healthy adults; situational for specific symptoms |
| Artificial sweeteners | Limit, particularly saccharin and sucralose | Moderate — strongest in animal models, developing in humans |
| Post-antibiotic recovery | Fermented foods + diverse fibre, not an immediate probiotic | Direct trial evidence favours this over the popular alternative |
What Actually Matters Most
If this guide reduces to two habits: eat fermented food regularly, and eat a wide variety of plants across the week rather than the same handful on repeat. Both are supported by the strongest evidence in this guide, both are inexpensive, and both compound — a diverse, fermented-food-inclusive diet supports the mechanism behind nearly every other recommendation in this guide, from prebiotic fibre to reduced dependence on probiotic supplements.