Hormonal
Dietary fish oil (n-3 fatty acids) preserves hepatic insulin sensitivity in high-fat diet-fed wild-type mice by activating PPAR-α, which reduces hepatic diacylglycerol levels; this protective effect is abolished in PPAR-α null mice, demonstrating PPAR-α dependence.
Fish oil supplementation may help maintain liver sensitivity to insulin when consuming a high-fat diet, but this benefit relies on having functional PPAR-α. The mechanism involves reducing specific lipid signals (diacylglycerol) rather than just lowering total liver fat. For humans, this suggests fish oil is a supportive tool for metabolic health, particularly if you have high fat intake, but it is not a standalone cure for insulin resistance.
These data support the hypothesis that n-3 fatty acids protect from high-fat diet–induced hepatic insulin resistance in a PPAR-α– and diacylglycerol-dependent manner.
Why this rating
High-quality mechanistic data in mice using knockout models, but not directly translatable to human clinical outcomes without further validation.
Source
n-3 Fatty Acids Preserve Insulin Sensitivity In Vivo in a Peroxisome Proliferator–Activated Receptor-α–Dependent Manner
Susanne Neschen et al. · Diabetes · 2007
DOI 10.2337/db06-1206
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