Trust

What certainty tiers actually mean.

When you see "High Certainty" on a claim, here's exactly what that measures — and what it doesn't.

Every claim on FitChef synthesizes evidence from multiple independent studies. Some claims are backed by large meta-analyses where every research group found the same thing. Others rest on smaller studies with mixed results. These are fundamentally different levels of evidence — and readers deserve to see the difference at a glance.

That's what certainty tiers do. They describe how consistently the evidence points in one direction. Not whether FitChef thinks the claim is "true." Not whether you should act on it. Just how aligned the research is.

Three Tiers, One Question

Each tier answers the same question: how consistently do independent studies agree?

H
High Certainty

Multiple high-quality studies — typically meta-analyses or large randomized controlled trials — converge on the same finding. Independent research groups, using different methods and populations, reached consistent conclusions. The evidence points strongly in one direction.

M
Moderate Certainty

The evidence leans in one direction, but with caveats. Some studies diverge, sample sizes are smaller, or the research has only been replicated once. The finding is supported but not settled — new research could shift the answer.

L
Low Certainty

The evidence is early-stage, limited, or conflicting. The claim may rest on a single study, a small sample, or research that hasn't been replicated. We include it because the finding is noteworthy — but the tier signals that the science is still developing.

How the Tier Is Determined

Certainty tiers are calculated algorithmically — not editorially. No human at FitChef decides whether a claim deserves "High" or "Low." Instead, our verification pipeline evaluates five factors from the underlying studies: study design quality (meta-analyses and RCTs score higher than observational studies), sample size, replication (did multiple independent groups find the same thing?), effect size, and disclosed limitations.

These factors produce an Evidence Consistency Index — a number that feeds directly into the tier assignment. The index and the tier are then verified by our Skeptic Protocol: an automated system of 5 verification gates and 28 kill switches that checks whether the tier is mathematically justified by the evidence. If it's not — the content fails and doesn't publish.

What a Certainty Tier Is Not

A certainty tier is not FitChef's opinion. It's not a recommendation. And it's not medical advice.

"High Certainty" means the studies agree — it does not mean "you should do this." A claim can have High Certainty and still not apply to your specific situation, health history, or goals. Certainty describes the state of the evidence. What you do with that evidence is a conversation between you and a qualified professional.

FitChef is a digital publisher that translates peer-reviewed research into content people love. We report what studies found. We never prescribe what readers should do. For more about how we verify every data point we publish, see our Methodology and How We Verify pages.