Macro partitioning
Replacing saturated fatty acids (SFA) with polyunsaturated fatty acids (PUFA) reduces cardiovascular disease (CVD) risk, whereas replacing SFA with refined carbohydrates (starches and sugars) has a neutral or adverse effect on CVD risk.
Don't just cut fat; look at what you replace it with. If you cut saturated fat (like butter or fatty meat) but replace it with refined carbs (white bread, sugar), your heart risk may not improve or could get worse. Instead, replace saturated fats with unsaturated fats (like olive oil, nuts, or fish). This substitution, not just calorie cutting, is what lowers cardiovascular disease risk.
Focusing on effects of nutrient substitution rather than high versus low SFA indicates that replacement of SFA with n-6 fatty acids is associated with lower CVD risk, while replacement of SFA with refined CHOs (starches and sugars) is associated with a neutral or adverse effect.
Why this rating
Based on high-quality RCTs (e.g., Wadsworth, Veterans Administration) and large prospective cohort studies, though the paper notes challenges in meta-analyses.
Source
Pathways and mechanisms linking dietary components to cardiometabolic disease: thinking beyond calories
Kimber L. Stanhope et al. · Obesity Reviews · 2018
DOI 10.1111/obr.12699
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