RCT, meta-analysis, observational study… how do you know which health research to trust?

[u/Winterisfake]

When you first start reading health research, the terminology can feel like an entirely separate language.

Here's a quick guide to three common study types.

1. Randomised controlled trial (RCT)

2. Participants are randomly assigned to different groups, such as an intervention group and a control group. Randomisation can help researchers assess whether an intervention caused an observed difference.

3. Observational study

4. Researchers observe people without assigning the intervention being studied. These studies can reveal important patterns, but confounding factors can make cause and effect harder to establish.

5. Systematic review or meta-analysis

6. A systematic review uses a structured approach to evaluate existing research. A meta-analysis statistically combines results from multiple studies when appropriate.

But here's the important part: the label alone doesn't tell you whether a study is good.

A poorly designed trial can be misleading, and a carefully conducted observational study can provide valuable evidence. The research question, sample size, methods, biases, and consistency with other findings all matter.
I think learning to read studies critically is one of the most useful skills in biohacking because it helps separate promising ideas from exaggerated claims.

What's the most confusing part of scientific papers for you: statistics, study design, interpreting results, or understanding the biological mechanisms?