An open, objective map of the scientific evidence on plant-based nutrition — built for clinicians, researchers, students, and the curious public.
Evidence-based practice (EBP) is the conscientious integration of the best available research evidence with clinical expertise and patient values. Rather than relying on tradition, authority, or anecdote, EBP asks: what does the totality of the scientific literature actually show?
Not all evidence is equal. A single case report tells a different story than a meta-analysis pooling 50,000 participants. The evidence pyramid is the framework clinicians and researchers use to rank study types by their methodological rigor — from mechanistic bench studies at the base to clinical practice guidelines at the apex.
Understanding where a study sits in the pyramid helps you weigh its conclusions appropriately. A randomized controlled trial showing a 10% reduction in HbA1c carries more weight than an observational association — but a guideline endorsed by the American Diabetes Association carries more weight still, because it synthesizes the entire body of evidence.
Clinical Practice Guidelines
Recommendations from major medical & nutrition bodies
Systematic Reviews & Meta-Analyses
Synthesized evidence pooled across multiple studies
Clinical Trials
Randomized and non-randomized human intervention studies
Observational Studies
Cohort & cross-sectional studies in large populations
Case Reports & Series
Documented individual or small-group clinical outcomes
Mechanistic Studies
Lab & animal studies establishing biological plausibility
Tiers listed from apex (highest rigor) to base. Colors match the interactive pyramid on the homepage.
Plant-based nutrition is one of the most studied — and most misrepresented — areas in modern medicine. Advocates overstate certainty; critics dismiss robust evidence. Patients and clinicians are left navigating a noisy landscape without a clear map.
This site was built to provide that map. Every study is indexed by evidence level, disease area, and classification (supportive, neutral, mixed, or not supportive). Nothing is hidden. A study showing null results sits alongside one showing dramatic benefit — because that is what the evidence actually looks like.
Our goal is not to advocate for any dietary pattern. It is to make the scientific record accessible, navigable, and honest — so that clinicians can counsel patients with confidence, researchers can identify gaps, and the public can engage with the evidence directly.
All classifications — supportive, neutral, mixed, and not supportive — are indexed equally. No cherry-picking.
We index across all evidence tiers, from mechanistic bench studies to clinical practice guidelines.
Anyone can submit a study for review. The database grows through community contribution and expert curation.
The strength of this resource depends on the breadth of its index. If you know of a peer-reviewed study on plant-based diets and chronic disease that isn't here — whether it supports, contradicts, or complicates the picture — we want it included.
Use the submission tool to provide a PubMed ID or URL. Our system will auto-extract the citation, PICO framework, and key findings for your review before submission. All entries are reviewed before publication.
This site is for educational and research purposes only. Nothing here constitutes medical advice. Study summaries are provided to aid navigation of the literature — always read the original publication and consult a qualified clinician before making dietary or medical decisions. Classifications reflect the study's own findings and methodology; they are not endorsements.