Walk into any Indian supermarket and you will find shelves of cooking oil. Groundnut oil. Sunflower oil. Sesame oil. Some bottles say cold pressed. Some say pure. Some say refined. Most buyers pick based on price or brand familiarity.
Very few buyers know that two bottles labelled groundnut oil can contain products that are nutritionally, chemically, and sensorially almost nothing alike.
This article explains exactly why cold pressed oil and regular refined oil are fundamentally different products, despite sharing a name on the label.
They Start the Same Way
Both cold pressed oil and refined oil begin with the same raw material. Groundnut seeds. Sesame seeds. Sunflower seeds. The starting point is identical.
What happens next is where everything diverges.
How Regular Refined Oil Is Made
Most cooking oil sold in Indian supermarkets is produced through a five-stage industrial process.
Stage 1: Solvent Extraction
Seeds are treated with hexane, a petroleum-derived solvent, which dissolves the oil out of the seed. Hexane extraction produces a higher yield than mechanical pressing, approximately 35 to 40 percent of the seed weight compared to 20 to 25 percent through cold pressing. This yield advantage is the primary reason the industry uses it.
The process happens at elevated temperatures. Every heat-sensitive nutrient in the seed begins to degrade at this stage.
Stage 2: Degumming
The crude oil contains naturally occurring phospholipids, gums, and other compounds. These are removed through treatment with water, acid, or enzymes. Some of these compounds have nutritional value. They are removed because they interfere with the subsequent refining stages, not because they are harmful.
Stage 3: Neutralising
Free fatty acids are removed by treating the oil with an alkaline solution. This step raises the oil's smoke point and extends its shelf life. It also removes naturally occurring fatty acid compounds that contribute to flavour and aroma.
Stage 4: Bleaching
Clay and mild acid are used to remove colour, residual soap from neutralisation, and remaining trace compounds. This stage removes phytosterols, the plant compounds that compete with cholesterol for absorption in the digestive tract.
This is also where refined oil acquires its characteristic pale, uniform appearance. That clarity is the visual evidence of what has been removed.
Stage 5: Deodorising
The oil at this point smells of the chemicals used to process it. Steam deodorising at temperatures between 200 and 270 degrees Celsius strips the remaining volatile compounds and achieves the neutral, odourless character that refined oil is known for.
This stage eliminates Vitamin E almost entirely. It destroys resveratrol completely. It removes every natural aroma compound. In some cases it can alter the geometric structure of unsaturated fatty acids, creating small amounts of trans fats.
After deodorising, synthetic antioxidants are added to restore shelf stability.
What emerges is a pale, neutral, shelf-stable liquid. It contains the calories of the original seed oil and very little of its original nutrition.
How Cold Pressed Oil Is Made
A traditional Babul wood Kachi Ghani presses seeds using slow mechanical pressure. The wood absorbs the heat generated by friction, keeping the extraction temperature below 45 to 50 degrees Celsius throughout the process.
No solvents. No bleaching. No deodorising. No synthetic additions.
The oil that comes out is the direct result of the seed being mechanically pressed. The yield is lower, which is why cold pressed oil costs more. It takes 3 kilograms of groundnuts to produce 1 litre of cold pressed groundnut oil.
After pressing, the oil settles naturally for 72 hours. No centrifuges. No filter aids. The slight cloudiness that results from this process is evidence that nothing beneficial was filtered away.
The oil is then independently lab tested before bottling. What goes into the bottle is the seed, pressed. Nothing more and nothing less.
The Nutritional Difference
Vitamin E
Vitamin E (tocopherol) is the most heat-sensitive antioxidant in cooking oil. It begins to degrade above 50 degrees Celsius. At 200 to 270 degrees Celsius, it is nearly eliminated.
Cold pressed groundnut oil retains over 90 percent of the natural tocopherol content of the seed. Refined groundnut oil retains approximately 20 to 22 percent. The synthetic antioxidants added back during refining do not replicate the nutritional function of natural Vitamin E.
Resveratrol
Groundnut oil naturally contains resveratrol, the polyphenol associated with cardiovascular health. It survives cold pressing. It does not survive industrial refining. Refined groundnut oil contains none.
Phytosterols
Plant compounds that compete with cholesterol for absorption in the digestive tract. Present in cold pressed oil. Removed during bleaching in refined oil.
Natural Lecithin
Supports bile production and fat-soluble vitamin absorption. Present in cold pressed oil. Removed during degumming in refined oil.
Trans Fats
Cold pressing produces zero trans fats because no temperature above 50 degrees Celsius is applied. Refined oil carries a small risk of trans fat formation during high-temperature deodorising.
The Sensory Difference
This one is immediate and requires no laboratory to verify.
Open a bottle of cold pressed groundnut oil. The aroma is warm, nutty, and distinctly of groundnuts. This is not a flavouring added to the oil. These are the natural volatile aroma compounds that survived because the oil was never heated above 50 degrees Celsius.
Open a bottle of refined groundnut oil. The smell is faint or absent. This is the result of deodorising at 200 to 270 degrees Celsius.
These same volatile compounds that produce the aroma also carry antioxidant properties and contribute flavour to dishes. They are not incidental. They are part of what the seed produces and what cold pressing preserves.
The easiest test for any oil claiming to be cold pressed: open the bottle and smell it. Cold pressed oil should smell strongly of the seed it came from. If it has almost no smell, it has been deodorised.
The Processing Difference Side by Side
|
What Changes |
Cold Pressed Oil |
Refined Oil |
|
Extraction method |
Mechanical press |
Hexane solvent |
|
Temperature |
Below 45 to 50°C |
200 to 270°C |
|
Chemicals used |
None |
Hexane, bleaching agents, neutralisers |
|
Vitamin E retained |
Over 90% |
20 to 22% |
|
Resveratrol |
Present |
None |
|
Natural aroma |
Fully preserved |
Stripped by deodorising |
|
Trans fat risk |
Zero |
Possible |
|
Synthetic additives |
None |
Added after processing |
|
Appearance |
Naturally golden, may be slightly cloudy |
Pale and uniformly clear |
|
Settling |
72 hours natural |
Centrifuged and filtered |
The Cloudiness Question
Many buyers are concerned when they see slight cloudiness in cold pressed oil. Supermarket oils are uniformly clear and buyers have been conditioned to associate clarity with quality.
The opposite is true for cold pressed oil.
Cloudiness in cold pressed oil is evidence of natural settling without industrial filtration. Fine particles that have not been removed by centrifugation or clarifying agents remain suspended in the oil. These particles contain beneficial compounds.
Refined oil's clarity is achieved through bleaching and filtration that removes both the undesirable particles and the beneficial compounds that came with them.
Cloudy cold pressed oil is not a defect. It is confirmation that the oil has not been industrially filtered.
Why They Cannot Be Used Interchangeably in Every Situation
For the vast majority of Indian cooking, cold pressed and refined oil are interchangeable in practice. Tadka, sauteing, parathas, chutneys, marinades, shallow frying, and most everyday preparations sit within the smoke point range of cold pressed oil.
There is one genuine exception: deep frying above 180 degrees Celsius.
Cold pressed groundnut oil has a smoke point of approximately 160 degrees Celsius. Cold pressed sesame oil reaches approximately 177 degrees Celsius. Deep frying requires sustained temperatures above 180 degrees Celsius. For this specific application, cold pressed oil is not the appropriate choice and we say so clearly.
For everything else, the practical cooking difference is minimal. The nutritional difference is significant and cumulative across every meal cooked with the oil.
Why This Matters for Daily Life
The cooking oil used in an average Indian household is not an occasional ingredient. It is present in every meal, every day, for every member of the family.
This frequency is exactly why the nutritional difference between cold pressed and refined oil compounds in a way that no occasional superfood or supplement can replicate.
A family cooking with refined oil three times a day is missing the Vitamin E, resveratrol, phytosterols, and natural lecithin that the same quantity of cold pressed oil would deliver. Not occasionally. At every meal.
A family cooking with cold pressed oil three times a day is receiving natural, bioavailable nutrition from the oil they were already planning to use.
No additional habits. No supplements to remember. No dietary changes. Just better oil in the same cooking.
The Honest Summary
Cold pressed oil and refined oil are not two versions of the same product. They are two different products that share a source ingredient and a name on the label.
Cold pressed oil is the seed, mechanically pressed below 50 degrees Celsius, with its nutritional content intact.
Refined oil is the seed's oil, chemically extracted and industrially processed at temperatures between 200 and 270 degrees Celsius, with its nutritional content largely eliminated and synthetic compounds added back.
The seeds are the same. The processing determines everything that follows.