Research
Macro partitioning
Replacing saturated fats with polyunsaturated fats (PUFA) does not convincingly reduce cardiovascular events or mortality and may have null or adverse effects on stroke risk.
Replacing saturated fats with polyunsaturated fats does not clearly reduce heart disease risk and may increase stroke risk. Focus on the quality of your overall diet and food sources rather than just swapping fat types.
LimitedRefutesMEDIUM confidence
A recent review of reviews, or 'umbrella review,' of the observational data reported that replacing SFA with PUFA did 'not convincingly reduce cardiovascular events or mortality' and that one 'must consider that the diet-heart hypothesis is of uncertain validity.'
Why this rating
Based on narrative review of observational studies and meta-analyses.
Source
Dietary Saturated Fats and Health: Are the U.S. Guidelines Evidence-Based?
Arne Astrup et al. · Nutrients · 2021
DOI 10.3390/nu13103305
narrative_reviewCited 80×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Saturated fat intake increases HDL cholesterol and improves the total-to-HDL cholesterol ratio, which are robust markers of cardiovascular disease risk.Moderate
- Limiting dietary saturated fat intake to 10% of total calories does not reduce cardiovascular disease events or mortality and is not supported by rigorous scientific evidence.Limited
Related findings · Macro partitioning
- Total daily protein intake of 1.6 g/kg/day is sufficient for maximizing resistance training-induced muscle gains, with an upper confidence interval of 2.2 g/kg/day.Strong
- Resistance exercise training combined with sufficient dietary protein intake acts synergistically to maximize skeletal muscle hypertrophy, with protein intake saturating around 1.6 g/kg/day for general populations and potentially requiring 2.0-2.2 g/kg/day for resistance-trained individuals.Strong
- Trans fats should be completely eliminated from the diet, as they increase LDL cholesterol, decrease HDL cholesterol, and are directly associated with increased coronary risk.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →