Belief me, I do not believe in fear mongering… concern of chemical compounds, fear of unknown, or concern of disease.. No! That isn't what we'll do right here, and why? Because we are individuals of science and we'll dissect this "oil refining" subject very scientifically!
What is Oil Refining?
Refining is a process of purification of oils. In this process, oils are robbed of naturally occurring gums, proteins, phospholipids, fine seed particles etc. This makes the oil "light/losorb". Oils are additionally neutralized (acidity balanced!), bleached (stripped of color) and deodorized (devoid of it’s natural aroma). And to achieve all these the oil is heated at high temperatures and is handled with chemical substances etc.
Details on Oil Refining Process Here.
What they take out throughout refining is just not essentially bad or toxic, on the contrary these substances are fairly important for our health!
Phospholipids: Are essential component of cell membrane (bear in mind the fluid mosaic model?). Thus dietary phospholipids are extremely essential for integrity of every single body cell and for our overall well-being.
Proteins: Want I explain the importance of dietary proteins?
Vitamins : most plant based oils are rich in beta carotene which is a precursor of vitamin A. Not just that, certain oils are a great source of Vitamin E as well(Sunflower, Safflower, Almond etc.). And these are well preserved during cold pressing. Whereas refinement strips all of them away, a lot so that oil companies should add it back and enrich the cooking oils with these lost nutritional vitamins!
Antioxidants: Carotenoids and chlorophyll (bear in mind photosynthesis?) are plant pigments with antioxidant properties. And these are preserved during cold pressing.
Lecithin: Within the figure above, see that very first step of "Degumming"? Throughout that process Lecithin is taken out of oil. Lecithin is a source of Choline, an important vitamin like substance that may be a precursor of neurotransmitter acetylcholine! Lecithin is necessary folks, so much so that it's sold in the form of dietary supplements.
Now these have been just some major nutrients we had been talking about, other than those there are quite a few trace minerals and important fatty acids that are additionally misplaced through the refining process!
In a nutshell, fashionable refined cooking oils provide nothing but pure empty energy (devoid of all vitamins however fats!)
Now you'd ask if refining is sooo…NOT GOOD, then why do oil firms opt for it?
Well they have their very own reasons, like-
It will increase the shelf life: Most refined oils stay good for up to 2 years whereas virgin oils are vulnerable to fast rancidification, oxidation, and go bad if not used within 3–4 months of manufacturing!
Total yield: Cold pressing isn't the best strategy of extracting the oils! In cold pressing, oil yield is nearly 5–6lit/10kg of seeds, which means weight by weight yield is barely ~50%. Whereas in industrial refining hydraulic pressure is used for pressing, and never just that, solvents like hexane are used to extract as much oil as possible. In refined oil production, virtually a hundred% of raw oil press
is extracted from the seeds!
Fashionable Cooking: Refining by eliminating the signature style and odor of any oil, renders it a neutral taste and appearance that may go along with almost all cooking styles and all flavors!