Toxins from certain blue-green algae in water can survive boiling and damage the liver over time, potentially causing cancer.
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design cannot support claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study is a narrative review with no primary data; it reports associations and mechanisms from prior literature but cannot establish causation in humans.
More Accurate Statement
“Chronic exposure to microcystins from cyanobacterial blooms is associated with liver damage and an increased risk of liver tumor development in humans, based on mechanistic and epidemiological evidence from prior studies.”
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
Microalgae toxins in food products and impact on human health: a review
This study doesn’t do new experiments, but it says that toxins from blue-green algae (like microcystins) can hurt the liver and cause cancer when people eat contaminated food or drink polluted water — which matches what the claim says.