About fats and oils

Do you know what the most healthy or the least healthy cooking oils are?  I used to think that vegetable cooking oils are healthy until I saw this cooking oil scorecard by Dr Steve.

I did a search online and came across a video by Dr Steve Ekberg.  I do not know if he is the same doctor mentioned on the scorecard.  This is his list of the worst cooking oils which I have extracted from his video.

I am glad to see that the worst cooking oils listed by him turned out to be the more expensive types of oil sold in Malaysia.

As the doctor said in his video, if you are extracting oil from vegetable, you would think that it should be edible throughout any part of the processes.  However, as hexane is used as a special-use solvent to extract edible oils from seeds and vegetables and also as a cleaning agent, the oil has to be refined before it is edible.  Hexane (C6H14) is a hydrocarbon extracted from crude oil.  I read that it has gasoline-like odor which is why it has to be deodorize so that its flavour will become mild.  Also, the oils may still contain trace amounts of hexane after the process.

He also shared the negative result of refined vegetable oils.

A cooking oil's smoke point refers to the temperature when the oil starts to smoke.  We tend to use high heat when we cook Chinese dishes. So, we should use oils with a high smoke point as they are ideal for frying, sautéing, stir-frying and searing.  So take note of the smoke point of cooking oils recommended by Dr Steve Ekberg because once an oil reaches its smoke point, it is an indication that the fat in the oil is breaking down. 

Overheating oils past their smoking point has been linked to the formation of carcinogens and can also create an off, burnt flavor.  So, if you need to cook a dish with high heat, the smoke point of 250 °C or 482 °F for ghee is a good choice. Palm oil is produced in Malaysia. It is noted on Wikipedia that its smoke point is 235 °C or 455 °F.  However, it has to be noted that it is expelled from the palm kernels via pressing or hexane extraction.

The doctor also suggested that we should not often deep fry our food with oil and to avoid repeatedly heating cooking oil which is often the case in restaurants where they reuse cooking oil over and over again.  I hope that by sharing his clips, you will take the time to watch his video and understand better how he came to his conclusion for all types of fats and oils.  You will also pick up some cooking tips from him.