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Eat a wider variety of plant foods each week

Rotate different vegetables, fruits, legumes, whole grains, nuts and seeds across the week.

At a glance

  • What we know: Plant variety is associated with microbiome differences; an optimal weekly target is not established.
  • What’s uncertain: Observational microbiome differences do not establish an optimal weekly plant count or prove a clinical health benefit.
  • First step: Rotate familiar plant foods when shopping, for example using a different bean, vegetable or whole grain next week.
  • Before you try it: Work within food allergies and any prescribed diet; do not add foods you have been advised to avoid. All precautions

Takeaway

The American Gut observational study linked dietary plant variety with microbiome and metabolite differences in a self-selected citizen-science cohort. Its comparison of fewer than 10 with more than 30 plant types per week does not establish that 30 is an optimal target or that reaching it improves clinical health. This entry focuses on variety, complementing the separate habits about fibre quantity and overall fruit and vegetable intake.

Several varieties of fresh vegetablesDiscussed byTim SpectorView statements ↓
NutritionUnder 10 min · Easy · Low
Reviewed Sep 29, 2026
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Scientific evidence

What the research shows

Outcome assessments based on research, including its uncertainties and limitations.

No outcome assessment published

This entry is an overview. Its background references do not establish whether the practice works.

What people say

Who discusses this?

Public statements, with positions specific to each source and topic. These views do not determine the scientific evidence assessment.

What the research shows ↑

Practical steps and precautions

How to try it

  1. Rotate familiar plant foods when shopping, for example using a different bean, vegetable or whole grain next week.
  2. Include variety across food groups rather than buying many expensive speciality ingredients.
  3. Use a weekly list if useful; 30 plants is a popular heuristic, not a minimum requirement or a validated treatment dose.

Precautions

  • Work within food allergies and any prescribed diet; do not add foods you have been advised to avoid.
  • Increase fibre-rich foods gradually if they cause digestive discomfort.

References

Background and safety references

These support context and precautions; they are separate from assessed outcome sources.

American Gut: an Open Platform for Citizen Science Microbiome Research.

McDonald D, Hyde E, Debelius JW, Morton JT, Gonzalez A, Ackermann G, Aksenov AA, Behsaz B, Brennan C, Chen Y, DeRight Goldasich L, Dorrestein PC, Dunn RR, Fahimipour AK, Gaffney J, Gilbert JA, Gogul G, Green JL, Hugenholtz P, Humphrey G, Huttenhower C, Jackson MA, Janssen S, Jeste DV, Jiang L, Kelley ST, Knights D, Kosciolek T, Ladau J, Leach J, Marotz C, Meleshko D, Melnik AV, Metcalf JL, Mohimani H, Montassier E, Navas-Molina J, Nguyen TT, Peddada S, Pevzner P, Pollard KS, Rahnavard G, Robbins-Pianka A, Sangwan N, Shorenstein J, Smarr L, Song SJ, Spector T, Swafford AD, Thackray VG, Thompson LR, Tripathi A, Vázquez-Baeza Y, Vrbanac A, Wischmeyer P, Wolfe E, Zhu Q, American Gut Consortium , Knight R. · mSystems · 2018

Self-selected citizen-science observational microbiome study; full text retrieved 2026-09-29Verified from full textBackground or safety reference
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Related habits

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Editorial history and review method

Revision 2 · Approved for publication · Codex (publication approval explicitly authorized by site owner; category migration)

Prepared and checked with AI. Publication approval does not imply independent expert review. Request a correction.

Added after overlap review on 2026-09-29. Retrieved original research metadata and abstracts; statements in videos remain separate from scientific evidence. Independent editorial approval remains pending. Recheck the narrow population and outcome framing, the effect direction, and all implementation advice before public approval. Publication release 2026-10-04: site owner authorized a bounded AI audit and release of this exact revision. See docs/release-audit-2026-10-04.md for source-check findings and limits. No independent health-professional or peer review is claimed. Category migration 2026-10-04: removed the separate goals field; categories: Nutrition → Nutrition. Research assessments, sources, guidance, precautions, and evidence review dates are unchanged. This revision awaits publication approval; no new evidence review is claimed. Publication approval 2026-10-04: site owner explicitly accepted all current category-migration revisions for deployment and requested that remaining limitations be retained in docs/content-review-backlog.md. Approval applies to this exact content revision. No new evidence review, independent expert review, or clinical validation is claimed; existing precautions and disclosures remain in effect.