Adults with prediabetes who eat two cans of sardines every week for a year have higher HDL cholesterol levels than those who do not eat sardines.

See the scientific wording

Consuming two cans of sardines per week for one year increases HDL cholesterol levels in adults with prediabetes compared to no sardine consumption.

Supporting

Strong

1 study

Contradicting

None

1 study

Very strong evidence

Randomized trials

2 good-quality studies support this claim.

What the research says

2 studies reviewed

Supporting (1)

Strong

Type 2 diabetes preventive effects with a 12-months sardine-enriched diet in elderly population with prediabetes: An interventional, randomized and controlled trial.
Randomized Controlled TrialHuman2021
People with prediabetes who ate two cans of sardines every week for a year ended up with higher levels of 'good' cholesterol than those who didn’t eat sardines, according to a well-run study.

Contradicting (1)

None

Changes in lipoprotein particle subclasses, standard lipids, and apolipoproteins after supplementation with n-3 or n-6 PUFAs in abdominal obesity: A randomized double-blind crossover study.
Randomized Controlled TrialHuman2021
The study gave people fish oil supplements and found their 'good' cholesterol (HDL) went down, not up. So if sardines have the same oil, they probably won't raise HDL like the claim says.

Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.

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Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting, 1 contradicting studies

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