From Dr. Mercola
Extra-virgin olive oil is a good monounsaturated fat that is also well-known for its health benefits. It's a staple in healthful diets such as Mediterranean-style diets.
However, it's important to realize it is NOT good for cooking. It should really only be used cold, typically drizzled on salads and other food.
Due to its chemical structure and a large amount of unsaturated fats, cooking makes extra-virgin olive oil very susceptible to oxidative damage. However, during this interview I learned that extra-virgin olive oil has a significant draw-back even when used cold – it's still extremely perishable!
As it turns out, extra-virgin olive oil contains chlorophyll that accelerates decomposition and makes the oil go rancid rather quickly.
In fact, Dr. Moerck actually prefers using almost tasteless, semi-refined olive oil rather than extra-virgin olive oil for this reason.
If you're like most people, you're probably leaving your bottle of olive oil right on the counter, opening and closing it multiple times a week. Remember, any time the oil is exposed to air and/or light, it oxidizes, and as it turns out, the chlorophyll in extra virgin olive oil accelerates the oxidation of the unsaturated fats.
Clearly, consuming spoiled oil (of any kind) will likely do more harm than good.
To protect the oil, Dr. Moerck recommends treating it with the same care as you would other sensitive omega-3 oils:
- Keep in a cool, dark place
- Purchase smaller bottles rather than larger to ensure freshness
- Immediately replace the cap after each pour
To help protect extra virgin olive oil from oxidation, Dr. Moerck suggests putting one drop of astaxanthin into the bottle. You can purchase astaxanthin, which is an extremely potent antioxidant, in soft gel capsules. Just prick it with a pin and squeeze the capsule into the oil.
The beautiful thing about using astaxanthin instead of another antioxidant such as vitamin E, is that it is naturally red, whereas vitamin E is colorless, so you can tell the oil still has astaxanthin in it by its color.
As the olive oil starts to pale in color, you know it's time to throw it away.
You can also use one drop of lutein in your olive oil. Lutein imparts an orange color and will also protect against oxidation. Again, once the orange color fades, your oil is no longer protected against rancidity and should be tossed.
This method is yet another reason for buying SMALL bottles. If you have a large bottle, you may be tempted to keep it even though it has begun to oxidize.
The Worst Cooking Oils of All
Polyunsaturated fats are the absolute WORST oils to use when cooking because these omega-6-rich oils are highly susceptible to heat damage.
This category includes common vegetable oils such as:
Damaged omega-6 fats are disastrous to your health, and are responsible for far more health problems than saturated fats ever were.
Trans fat is the artery-clogging, highly damaged omega-6 polyunsaturated fat that is formed when vegetable oils are hardened into margarine or shortening.
I strongly recommend never using margarine or shortening when cooking. I guarantee you you're already getting far too much of this damaging fat if you consume any kind of processed foods, whether it be potato chips, pre-made cookies, or microwave dinners...
Trans fat is the most consumed type of fat in the US, despite the fact that there is no safe level of trans fat consumption, according to a report from the Institute of Medicine.
Trans fat raises your LDL (bad cholesterol) levels while lowering your HDL (good cholesterol) levels, which of course is the complete opposite of what you want. In fact, trans fats -- as opposed to saturated fats -- have been repeatedly linked to heart disease. They can also cause major clogging of your arteries, type 2 diabetes and other serious health problems.
Personally I don't cook very much but when I do I use our Pure Virgin Coconut Oil as it is the most resistant to heating damage, but also a great source of medium chained triglycerides and lauric acid.