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(chemistry) The chemical reaction of hydrogen with another substance, especially with an unsaturated organic compound, and usually under the influence of temperature, pressure and catalysts.
We know hydrogenated oils are not good to eat, but the hydrogenation process makes oils solid at room temperature and makes them hardier, so it takes longer for them to go rancid.
Trans fats come from the hydrogenation of oils and are known to raise cholesterol levels.
The process of hydrogenation creates what's known in the non-scientific world as trans fats.
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