system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does deep frying food causes it to lose its nutrients?

Additionally, why does eating too much deep fried food cause us to get a sore throat.
gpt
It doesn't. At least no more than any other cooking method. Some nutrients (like vitamin C) are heat sensitive, so you'll lose quite a bit (but not all) because the heat changes the nature of the nutrient - so your body no longer recognizes it or can use it as the original nutrient.

Many nutrients however are not heat sensitive (or nearly as sensitive as vitamin C). 

Also keep in mind that cooking in many cases greatly increases the bioavailability of nutrients (especially in vegetables). This means your body can absorb *more* nutrients, even if technically there is less available.

It is also a common misconception that deep frying means that your food is getting cooked because of heat from fat. What actually happens (and also why it is so important to coot in HOT fat / oil) is that the water inside your food heats up an turns into steam.

Because water and oil do not mix - the water / steam cannot escape the food (which you can see yourself when pan frying for example). Your food is actually getting steamed from the inside out.

Additionally - the water / steam also prevents oil from getting *into* the food. However if you overcook the food, or use cold oil - there will not be enough steam to make this happen - and you end up with overly greasy deep fried food.