Macro partitioning
When comparing high-monounsaturated fat diets directly to high-polyunsaturated fat diets, triglyceride levels are modestly but consistently lower on the polyunsaturated fat diet.
If your primary concern is lowering triglycerides (rather than LDL), choosing polyunsaturated oils (like corn, sunflower, or safflower oil) over monounsaturated oils (like olive oil) may provide a small additional benefit. However, for LDL cholesterol, both types of oils are equally effective when replacing saturated fat.
Triglyceride levels were modestly but consistently lower on the diets high in polyunsaturated fats (P=.05).
Why this rating
Meta-analysis of 14 studies, but the effect is borderline significant (P=.05) and small in magnitude.
Source
Monounsaturated Versus Polyunsaturated Dietary Fat and Serum Lipids
Christopher D. Gardner et al. · Arteriosclerosis Thrombosis and Vascular Biology · 1995
DOI 10.1161/01.atv.15.11.1917
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