seed oils are industrial by products not actually fit for human consumption... they are mega bombs of omega 6 polyunsaturated fats and the LAST thing you'd want to cook at high heat in a diet. its a great way to sustain an inflammatory state.

for cooking oils, stick to more stable saturated fats such as coconut, butter, ghee, tallow, palm oil. also some monounsaturated fats like lard and duck fat are a good way to go. do not cook with olive oil, that also goes rancid at high heat.