Scientists found a link between eating saturated fat and heart disease by leaving out data from different countries that didn't fit their idea.
Evidence from Studies
Supporting (1)
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The effect of replacing saturated fat with mostly n-6 polyunsaturated fat on coronary heart disease: a meta-analysis of randomised controlled trials
This study looked at past research on saturated fat and heart disease and found that when they only used the best studies without mistakes, there was no benefit. This means the original idea that saturated fat causes heart disease might have come from using bad data, which supports the claim.
Contradicting (1)
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Effect of reducing saturated fat intake on cardiovascular disease in adults: an umbrella review
The study looks at whether eating less saturated fat helps heart health, but it doesn't check if scientists left out data to make saturated fat look bad. So it doesn't prove or disprove the claim about hidden data.
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.