For those that have fried foods in their diet.
Vegetable oils are highly unstable. A recent study found that when seed oils containing these fats are
heated at a normal cooking temperature (of 180 degrees celsius), they create highly toxic chemicals known to be involved in cancer causation. And each time the oil was re-used the concentration increased massively. The study showed that by the fifth day of oil re-use, it had five times the concentration of these chemicals that it had on the first (which was
already alarmingly high).