High heat supplies the activation energy for a number of chemical reactions that transform the compounds in the food. One of the most important is the [Maillard reaction](https://en.wikipedia.org/wiki/Maillard_reaction), which denatures the proteins in cooked food and causes many changes in color and taste. This is why so many recipes say something like “cook at 350 °F” – lower temperatures aren’t hot enough to activate this process (or will only do so very slowly), while a higher temperature will quickly burn whatever you’re trying to cook.
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