The Study
Effects of dietary fats versus carbohydrates on coronary heart disease: A review of the evidence
This study is like a teacher summarizing what lots of other science experiments found about food and heart health — but they didn’t do any new experiments themselves. So they can say 'people who eat this way often have healthier hearts,' but they can’t say 'this food fixes your heart.'
Analysis score
Maximum 5 for a narrative review.
Where the score came from
Eating lots of white bread and sugary snacks instead of fats doesn't help your heart—and might hurt it, especially if you're older, overweight, or not active. But eating whole grains, fish, nuts, and avoiding junk food helps your heart stay healthy.
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 51 / 100
Quality score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—13–15% lower risk is meaningful for individuals and public health, especially since many diets still promote low-fat, high-refined-carb eating.
- 2High-quality diets lower heart disease risk by 13–15%.
- 3Eating refined carbs instead of fats doesn't help.
- 4Healthy fats (30–40% of calories) from plants and fish help.
- 5Trans fats from packaged foods make heart disease worse.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Related Content
Claims (10)
Eating more plants, whole grains, and healthy fats can lower your risk of heart disease by about 13 to 15%, no matter if you're cutting carbs or cutting fat.
Eating more whole grains like oats and brown rice instead of white bread and pastries may help lower your risk of heart disease because they help keep your cholesterol and inflammation in check.
Eating foods with trans fats—like packaged snacks, baked goods, and fast food—may raise your risk of heart disease because they can cause body-wide inflammation and mess up your cholesterol levels.
People who are older, women, don’t move much, or are overweight might be more likely to have bad health effects from eating lots of white bread, sugar, and pastries — and that could mean a higher chance of heart disease than for healthier people.
People who eat more whole grains like oats and brown rice, and fewer white breads and sugary snacks, tend to have less heart disease — and this pattern has been seen in many different groups of people.
Eating foods with trans fats, like fried snacks and baked goods, might raise your risk of heart disease because they can cause body-wide swelling and mess up your cholesterol levels.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.