What Happens When Cooking Oil is Reheated





When cooking oil is reheated, it starts separating before bubbling, and at extreme heat levels, it

will give out smoke. But they won't undergo any chemical change until you drop food items for

deep frying or sauteing etc.


When you deep fry food, a dehydration process starts. The water & water-soluble substances

get extracted from the food and are transferred to the cooking oil.

Oils then undergo chemical changes, and thus various degradation substances called total polar

materials (TPM) are produced in the oil due to these actions.


Repetitive heating contaminates the oil and harms your health adversely. Using a digital

cooking oil tester to check the TPM levels and discarding contaminated oil immediately can

reduce this risk.

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