How to evaluate health information
Bad health information kills people. Vaccine hesitancy, miracle cures, fad diets — most started with a real-looking source. Learn the cues that separate evidence from noise.
The evidence hierarchy
Not all sources are equal.
- · Systematic reviews & meta-analyses (highest)
- · Randomized controlled trials
- · Cohort & case-control studies
- · Case reports & expert opinion
- · Anecdotes & testimonials (lowest)
Red flags in health claims
- · ‘Doctors hate this!’
- · Single dramatic before/after
- · ‘Big Pharma is hiding it’
- · No mechanism, just results
- · Wants to sell you something
Go deeper
Real medicine has uncertainty, side effects, and contraindications. Anything that claims 100% effective with zero downsides is selling, not informing.
Trustworthy sources
- · CDC, WHO, NIH, peer-reviewed journals
- · University medical centers
- · Cochrane Library (meta-reviews)
- · Healthline (when citing primary sources)
📖 Case study: Wakefield & MMR
A 1998 paper falsely linked MMR vaccine to autism — based on 12 children, no controls, and conflicts of interest. It was retracted in 2010. The misinformation persists; measles outbreaks continue.
Takeaway: A single bad paper can damage public health for decades.
Key takeaways from this module
- Evidence has a hierarchy — anecdotes are at the bottom.
- Look for primary evidence, not just claims.
- Real medicine acknowledges uncertainty.
- Misinformation can persist long after retraction.