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What about peanut oil?
Peanut oil has a lot of polyunsaturated fat, which gets oxidized readily in the presence of heat. Those oxidized fats are highly damaging to your cells. So it seems like whether it's good for you depends on how you're using it. If you have cold-pressed peanut oil and are using it cold it's probably OK. If it's refined or used for cooking it's probably pretty bad. You can tell if it's refined by whether it tastes like peanuts or not. If it doesn't taste like peanuts it's refined.
I mostly use beef/pork fat for cooking but I get refined peanut for deep frying as it takes a ton of oil. I assumed it was better than "vegetable" oil or most other options. Oh well. I can only mitigate bad shit so much.
If you're deep frying you're fucking yourself no matter what oil, so just go with what's cheap and what tastes good. Nobody's perfect, so we all eat that shit sometimes, but it really should be limited to 3 or 4 times a year.
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