The Study
Reduction in saturated fat intake for cardiovascular disease.
This study looked at lots of people who changed how much saturated fat they ate, and found that those who ate less were a bit less likely to have heart problems like heart attacks or strokes over time. But it doesn’t prove it’s the fat alone that helped — other things they changed in their diet might have helped too.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
Eating less saturated fat (like butter and fatty meat) for a few years can lower your chance of having a heart attack or stroke — but only if you swap it with healthy fats or whole grains, not sugar. It doesn’t make you live longer or stop heart disease deaths outright.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 552 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — for every 56 people who cut saturated fat for 4 years, one avoids a heart event.
- 2But it doesn’t save lives overall.
- 317% fewer heart events (like heart attacks or needing surgery) after cutting saturated fat for 4 years.
- 456 people need to do it for 1 person to benefit.
- 5No change in death rates from heart disease or overall.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Cochrane database of systematic reviews
Year
2020
Authors
L. Hooper, Nicole Martin, O. Jimoh, Christian Kirk, Eve Foster, A. Abdelhamid
Related Content
Claims (6)
If you eat less saturated fat (like butter or fatty meat) but still eat lots of white bread, sugary snacks, or refined carbs, it probably won’t make your heart any healthier or lower your risk of heart disease.
If adults in developed countries eat less saturated fat for at least two years, they’re probably less likely to have heart attacks, strokes, or need heart surgery—about 1 in 56 people would avoid one of these events over four years.
If you eat less saturated fat for two years or more, it probably won’t make you live longer or stop you from dying of heart disease — at least not in countries with lots of food and healthcare.
If you swap out butter and fatty meats for foods like nuts, seeds, or bread and rice, you might lower your risk of heart problems—but we’re not sure if swapping for olive oil or chicken makes a difference.
When people eat less saturated fat, their cholesterol levels go down—and when cholesterol drops, they have fewer heart problems. This suggests that lowering cholesterol is the main reason eating less saturated fat helps the heart.
We don’t have strong enough proof to say whether eating less saturated fat makes heart attacks, strokes, or heart disease deaths more or less likely — the studies we have aren’t very reliable.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.