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A review published in Trends in Endocrinology & Metabolism, led by researchers at the University of Barcelona and the CIBER Area for Diabetes and Associated Metabolic Diseases (CIBERDEM) in Spain, concludes that fat type—not total fat quantity—drives divergent outcomes for insulin sensitivity.
Palmitic acid, the most common saturated fatty acid in U.S. foods, impairs insulin action; oleic acid, the monounsaturated fat concentrated in olive oil, appears to counteract that damage.
The findings add mechanistic weight to dietary guidance already favoring the Mediterranean pattern.
How Palmitic Acid Degrades Insulin Signaling Palmitic acid is pervasive in the American food supply: it appears in meats, dairy products, and cocoa butter, and in the form of palm oil across margarine, cereal, sweets, baked goods, and fast foods.
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