The scientific debate over the duration of GMO safety testing
In short: How long is long enough to prove a genetically modified crop is safe? This video explores the friction between standard 90-day feeding trials and the push for multi-year studies to detect long-term biological changes.
The controversy centers on experimental design and statistical power. A notable example is Gilles-Éric Séralini’s two-year study on Monsanto’s NK603 Roundup-tolerant corn, which faced heavy criticism regarding its small sample size and whether its results were statistically significant.
To address these concerns, European projects like GMO90+, G-TwYST, and GRACE have tested modified corn over extended periods. The core question for regulators is whether these longer studies reveal meaningful toxicological effects or if the standard 90-day trials remain sufficient for safety assessments.
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Sources
- Summary by Intellect · source: GMOs: How Long Should Safety Tests Really Last? | Part 5 | SLICE EARTH
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