A plant-based diet index and all-cause and cause-specific mortality: a prospective study.

In simple terms

This study looked at what people ate and then watched to see who got sick or passed away over many years. It found that people who ate more plants tended to live longer, but it doesn't prove that eating plants made them live longer—maybe they also exercised more or had better healthcare.

59%

Analysis score

59/ 72

Maximum 72 for a cohort study.

Where the score came from

Reporting0

Methodology56

Publication100

Statistical77

Study type (basis of the score)

Cohort Study

Level 2b - Individual cohort study

What’s the bottom line?

Scientists tracked what people ate for over 17 years and saw who lived or died.

Where does this study sit?

Reviews of RCTs (Meta-analyses)

Max 100

Randomized Trials

Max 90

Reviews of Cohort Studies

Max 85

Cohort Studies

Max 72

Reviews of Case-Control Studies

Max 63

Case-Control Studies

Max 58

Cross-Sectional & Case Series

Max 50

Expert Opinion

Max 5

StrongerWeaker

Cohort Studies

Level 2b

59 / 100

Quality score

Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.

Cannot establish causation

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Key takeaways

Summary

Based on the study abstract and findings.

1Yes — a 10–17% reduction in death risk is meaningful and comparable to quitting smoking or exercising regularly.
2People who ate the most plants had 17% fewer deaths overall, 13% fewer heart disease deaths, and 11% fewer cancer deaths than those who ate the least plants.

Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data