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It's not. it's actually better. Food browns faster and tastes better in seasoned oil. Fast food joints filter their oil every night but only change it ever so often.
A different answer:
It is bad to use the same cooking oil over and over because the molecular chemistry of the oil changes over time. The smoking temperature of the oil becomes lower and the oil gives off polymers and polar compounds increasing the risk of cardiovascular disease.
What else can I help you with?
Is it okay to turn a hamburger more than once during cooking?
Yes.
Does the pandora app play the same song more than once in one day?
The Pandora app can play a song more than once in the same day.
Can you switch more than once during the same at bat?
no
Do the Oregon ducks wear same jersey more than once?
no
Can you reheat mince meat?
As long as it has been stored properly at around 5ºC in a fridge, is no more than a few days old and is heated thoroughly all the way through you can reheat meat twice after cooking. But pork or chicken is not recommended more than once after cooking
Do you need a longer cooking time for 30 chicken thighs than say 10?
Yes, 30 chicken thighs require more cooking time than 10. This is because with so many cooking at once, the thighs placed at the top cook slower than those placed at the bottom.
What should you do if the same question was asked more than once?
If you know the two are indeed the same question than they should be merged.
Can you use the same Xbox Microsoft point codes more than once?
No
Can you get the same Webkinz a couple of times?
Yes, you can BUY more than one of the same webkinz. However, you cannot enter a webkinz's code more than once.
How can you register sims 2 more than once?
No EA only allows you to register a code once online, but if not online you can install it more than once, like if you uninstall it you can install it again on the same computer.
Is lighting same as battery?
yes except a battery is more compact and can be used more than once.
Can an egg be fertilized more than once?
No. But you can get two eggs fertilized at the same time.
