Isn't there still some not quite healthy stuff that happens even with fresh oil, just because of the high temps? Also having calories without also having somet

Isn't there still some not quite healthy stuff that happens even with fresh oil, just because of the high temps? Also having calories without also having something you're deficient in and need more of might be enough to qualify as unhealthy, unless it's displacing something worse. Does tallow do anything specifically beneficial for the majority of people who don't need added energy?