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Why did food manufacturers begin using hydrogenated oils?
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Trans fat
Commercially manufactured foods, including cookies, doughnuts, and muffins, often contain trans fats.
Food manufacturers began using hydrogenation primarily to convert liquid vegetable oils into semisolid fats, which were more versatile for various culinary and commercial applications.12
The adoption of this technology was driven by several key factors:
- Extended Shelf Life: Unsaturated fats are naturally susceptible to rancidity when exposed to air. Hydrogenation stabilizes these fats, significantly extending the shelf life and value of food products.23
- Texture and Consistency: The process allows manufacturers to create plastic fats, such as shortening and margarine, which are solid or semisolid at room temperature. This provided a practical alternative to animal-based fats like lard and tallow.12
- Economic Utility: In the United States, the process enabled the conversion of abundant, low-cost cottonseed oil into useful food products, effectively launching the modern shortening industry.1
- Perceived Health Benefits: For many years, hydrogenated oils were favored over animal fats because they were thought to be a healthier option, though later research revealed significant health risks associated with trans fat.2