Cold Pressed Oil vs Refined Oil: Which Is Actually Better for Cooking and Which One Should Diabetics Use?
Every time the question cold pressed oil vs refined oil comes up, you will find one consistent answer across the internet. Cold pressed wins. It has vitamins. It has antioxidants. It is natural. Refined oil has nothing left in it after all that processing. So cold pressed oil is better and you should switch to it.
This answer sounds convincing. And in some situations it is correct. But there is a problem with it. Everyone who says cold pressed oil is better is talking about the oil as a source of nutrition. They are not asking what you are actually doing with the oil. And what most Indian households do with cooking oil — frying parathas, making tadka, deep frying pakodas — involves heating that oil to 180 degrees Celsius or more.
Once you understand what happens to cold pressed oil at 180 degrees Celsius, the entire picture changes. This blog goes through the science from the beginning. How oil is actually formed inside a seed. How cold pressed oil and refined oil are made differently. What happens to each one when you heat it. And which one you should actually be using in your kitchen, especially if you have diabetes.
The Question Nobody Asks: What Is Cooking Oil Actually For?
Before comparing two types of oil, you need to answer one basic question. What is the true purpose of cooking oil in the first place?
Most people will say fat is an important nutrient. It gives energy, carries fat-soluble vitamins, supports brain function and cell membranes. All of that is true. But here is the thing: if nutrition from fat is what you need, you do not have to heat the oil to get it. You can make your sabzi and pour two spoons of ghee on top after it is cooked. You can eat a handful of nuts. You can drizzle cold pressed oil over a salad. You get the fat and the nutrition without any cooking at all.
So why do we put oil in the pan while cooking? Think about making a paratha. You put oil on the tawa, and that oil carries heat from the hot iron surface into the dough. The moisture inside the paratha evaporates, the outside crisps up, and you get that texture that a plain roti on a dry tawa would never give you. Same with pakodas. The oil at 180 degrees is the heat transfer medium that cooks the batter from all sides simultaneously and creates the crispy coating.
This is the actual primary purpose of cooking oil: heat transfer. Not nutrition. The oil is in the pan to move heat from the flame to your food efficiently and at a temperature that water simply cannot reach. Water evaporates at 100 degrees Celsius and disappears. Oil stays stable at 180 degrees and above. That is why we cook with oil and not water.
And if heat transfer is the primary job of cooking oil, then the single most important quality of a cooking oil is not how many vitamins it contains. It is how stable it stays under heat. Whether it oxidizes easily or resists oxidation. Whether it releases free radicals when heated or stays chemically stable. That is the only thing that matters when the oil is in a hot pan.
How Does Oil Form Inside a Seed?
To understand why cold pressed and refined oil behave differently, you need to understand what is actually inside a seed before extraction begins.
A plant photosynthesizes and produces glucose. That glucose travels to the seeds. Inside each seed, the cells convert that glucose into fat and store it in tiny balloon-like structures called oleosomes. These are the oil storage units of the seed. But a seed cell contains much more than just oleosomes. It also has separate compartments holding enzymes, vitamins, minerals, antioxidants, phytonutrients, water, protein and glucose. All of these components exist separately inside the cell, each in its own compartment, not mixing with each other.
The oil is kept in its oleosome compartment. The lipase enzyme, which is a fat-digesting enzyme, is kept in a separate compartment. The cell keeps them separate deliberately because if they were to mix, the lipase enzyme would immediately start breaking down the oil. The seed would not survive.
This separation is the key to understanding everything that follows about cold pressed oil and refined oil.
What Is Cold Pressed Oil and How Is It Made?
Cold pressed oil, also called kachi ghani oil or wood pressed oil in Indian markets, is oil extracted through slow mechanical pressing at temperatures that never exceed 60 degrees Celsius throughout the entire extraction process. The seeds are pressed slowly and gently so that the cell walls break without generating significant heat.
When the cells break open, everything inside comes out together. The oil comes out. But so does the lipase enzyme that was in its separate compartment. And the vitamins come out. And the antioxidants, the minerals, the water content, the proteins, the phytonutrients. Everything that was in those separate compartments is now mixed together in one liquid.
The oil is then filtered through a fine cloth to remove large solid particles. The vitamins, minerals, antioxidants and enzymes pass through the cloth and remain in the oil. So what you get is genuinely nutrient-rich oil with everything the seed had to offer.
The Problem With Cold Pressed Oil: Why It Goes Rancid Quickly
But here is what most cold pressed oil marketing does not tell you. The moment that lipase enzyme mixes with the oil inside the pressed liquid, it starts doing what it is designed to do. It starts digesting the fat. Breaking fat down produces free fatty acids. Free fatty acids make the oil rancid. They give it a stale smell and an off taste over time.
Additionally, the water content and the organic nutrients in the oil create a hospitable environment for bacteria. Bacteria also contribute to rancidity. This is why cold pressed oil has a short shelf life of three to six months and must be stored carefully in a cool, dark place. The very nutrients that make it healthy are also what make it degrade quickly once extracted.
How Is Refined Oil Made? The Full Process Explained
Refined oil starts with high-pressure mechanical extraction where seeds are pressed hard and fast to get maximum oil yield. This generates heat, so the oil comes out hot. At this stage, the crude oil contains oil plus all the vitamins, minerals, antioxidants, enzymes and impurities from the seed, similar to cold pressed oil.
Then the refining process begins in stages:
- Acid treatment: Acid is added to the crude oil. This causes the vitamins, phospholipids and other impurities to clump together and precipitate out of the oil.
- Alkali neutralisation: Alkali is then added to neutralise the acid and remove the soap-like compounds that can form during acid treatment.
- Bleaching: The oil is bleached to remove any remaining coloured compounds, residual impurities and the precipitated nutrient clumps.
- Deodorising with steam: Steam at 200 degrees Celsius is passed through the oil. This removes all remaining moisture, volatile compounds and any last traces of vitamins or organic material. The oil reaches 200 degrees in this process.
What comes out the other side is 99.9 percent pure fat. No vitamins. No minerals. No antioxidants. No enzymes. No water. Just oil. This is why refined oil has a very long shelf life. There is nothing in it for bacteria to grow on and nothing to react with itself and cause rancidity.
Cold Pressed Oil vs Refined Oil: Full Comparison
| Parameter | Cold Pressed Oil (Kachi Ghani) | Refined Oil |
|---|---|---|
| Extraction temperature | Below 60°C throughout | High pressure + heat + steam at 200°C |
| Nutrients retained | Vitamins, minerals, antioxidants, enzymes all present | Virtually none — 99.9% pure fat only |
| Shelf life | Short — 3 to 6 months typically | Long — 12 to 24 months |
| Why short shelf life | Lipase enzyme mixes with oil and starts breaking it down | No enzymes or moisture — nothing to cause rancidity |
| Taste and smell | Strong, natural, seed flavour | Neutral, odourless, flavourless |
| Heat stability for cooking | Lower — antioxidants burn off quickly above 60°C | Higher — pure oil is more stable under sustained heat |
| Antioxidant protection | Works only for short heat exposure | None — but not needed as less oxidation occurs |
| Best use | Raw — salad dressing, drizzle over cooked food, light quick tadka | Sustained cooking, deep frying, parathas, anything at 180°C+ |
| Price | Higher | Lower |
| Best for diabetics? | Raw use or very short heat only | Better for actual cooking where heat duration is long |
What Happens When You Heat Cold Pressed Oil to 180 Degrees?
Now here is the question that decides everything. Cold pressed oil contains vitamins, antioxidants and other nutrients. These are good things in the oil. But cold pressed oil was extracted at 60 degrees Celsius. It has never experienced higher temperatures than that. When you heat it to 180 degrees in your pan, these nutrients start burning.
The vitamins and minerals in the oil are not heat stable at 180 degrees. They break down. The oil begins to oxidize and release free radicals. People who argue for cold pressed oil cooking say: yes, but the antioxidants in the oil will neutralize those free radicals immediately. And that argument is correct, but only up to a point.
For a very short burst of heat, say 30 seconds of tadka where you are just spluttering some mustard seeds and then immediately adding water and vegetables, the antioxidants in cold pressed oil can work fast enough to neutralize most of the free radicals generated in that brief moment. The oil is not exposed to sustained heat long enough for the antioxidants to get overwhelmed.
But for frying a paratha, where the oil is in contact with a hot tawa for 10 to 15 minutes, or for deep frying pakodas where the oil is at 180 degrees continuously for half an hour, the antioxidants burn off early and are gone. What remains is oxidizing oil with no protection against further oxidation. At that point you are cooking with a damaged, oxidizing fat that generates free radicals with every passing minute. The nutrition argument for cold pressed oil has completely reversed.
Refined oil, with no nutrients to burn off, is just pure fat that simply transfers heat. It still oxidizes over time under sustained heat, but it does not have the additional problem of burning off its own nutrients and creating those breakdown products in the process.
Which Oil to Use for Which Type of Cooking: Practical Guide
| Cooking Situation | Oil Temperature | Use Cold Pressed? | Use Refined? | Reason |
|---|---|---|---|---|
| Raw salad dressing | No heat | Yes — best use | Not needed | Full nutrients preserved, no oxidation at all |
| Drizzle over cooked food | No heat | Yes — excellent | Not needed | All antioxidants reach body intact |
| Quick tadka — jeera, mustard seeds | Very short, high flash | Yes — acceptable | Either works | Short heat exposure, antioxidants survive briefly |
| Sabzi or curry cooking | 5 to 10 minutes 150-160°C | Borderline — okay | Better choice | Extended heat begins burning nutrients |
| Paratha on tawa | 10-15 min sustained heat | No — nutrients gone | Yes | Long contact with hot surface degrades cold press oil |
| Deep frying — pakoda, puri | 180°C+ for 15-30 min | No — avoid | Yes — always | Sustained extreme heat destroys nutrients, increases rancidity risk |
| Reheating cooked food | Repeated heating | No — especially not | Yes | Repeated heating compounds oxidation damage in cold press |
Which Oil Is Better for Diabetics: Cold Pressed or Refined?
For people with diabetes, the answer depends entirely on what you are doing with the oil. But the underlying principle is important to understand first.
Diabetes means blood sugar is already elevated. Elevated blood sugar causes chronic inflammation in the body. This inflammation is the primary cause of artery damage, kidney damage and the cardiovascular complications that come with long-term diabetes. Every additional source of inflammation in the diet makes this worse and makes blood sugar harder to control.
When you heat cold pressed oil for sustained cooking and the antioxidants burn off, the oil oxidizes and produces free radicals. Free radicals enter your food and then your body, where they add to the inflammatory load. For a person with diabetes whose inflammatory baseline is already elevated, this additional oxidative stress is the last thing they need from daily cooking.
Refined oil for high-heat cooking does not give you the nutrition of cold pressed oil. But it also does not produce the antioxidant burnoff and rapid oxidation that cold pressed oil produces when used beyond its heat tolerance. It is the lesser of two issues when the only alternative is cold pressed oil used for frying.
The best approach for diabetics combines both: use cold pressed oil for diabetics as a raw supplement, drizzled over salads or added to food after cooking to get genuine nutritional benefit from the antioxidants. Use a heat-stable fat like desi ghee, coconut oil or palm oil for actual cooking where heat is involved, because these have 90 percent or more stable fatty acids and generate the least free radicals under Indian cooking temperatures.
- Cold pressed oil, raw: Pour it over salad. Add it to a smoothie. Drizzle over dal after it is cooked. Mix into raita. Consume it without any heat and you get every nutritional benefit it has to offer.
- Cold pressed oil, light cooking: Quick tadka for 30 seconds where you are just tempering mustard seeds, jeera or curry leaves and immediately adding liquid. Very short heat exposure. Antioxidants can cope.
- Refined oil, cooking: Anything that involves 5 or more minutes of sustained heat at 150 degrees or above. Parathas, sabzi, curry making, deep frying. Choose a refined version of a stable oil like coconut oil, palm oil or groundnut oil rather than refined sunflower or refined soybean.
- For diabetics specifically: Do not use cold pressed oil for high-heat cooking. Prefer desi ghee, coconut oil or palm oil for everyday cooking. Use cold pressed oil raw to supplement your nutrition, not as your cooking medium.
One more thing worth knowing. If you buy cold pressed oil specifically to get the nutritional benefits, those benefits are completely real when the oil is used cold. The antioxidants, the vitamins, the phytonutrients, all of it is there and genuine. The mistake is assuming that because the oil is nutritionally rich, it is therefore better for all purposes including sustained high-heat cooking. Those are two completely different applications.
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Watch the detailed video explanation of cold pressed oil vs refined oil for cooking
Frequently Asked Questions
Cold pressed oil, also called kachi ghani or wood pressed oil, is extracted from seeds through slow mechanical pressing at temperatures below 60 degrees Celsius. Because no excessive heat or chemicals are used, the oil retains its natural vitamins, minerals, antioxidants and enzymes. Refined oil goes through acid treatment, bleaching and high-temperature steam deodorising that removes all these nutrients, leaving only pure fat. Whether cold pressed is better depends on how you use it. For raw consumption and cold applications like salad dressings, cold pressed is clearly better because all its nutrients reach your body intact. For sustained high-heat cooking at Indian temperatures of 180 degrees and above, refined oil performs better because cold pressed oil's nutrients burn off quickly and its antioxidant protection runs out during prolonged cooking.
Cold pressed oil has a short shelf life because when the seed cells are broken during pressing, the oil mixes with the lipase enzyme that was stored separately inside the cell. The lipase enzyme immediately begins digesting the fat, producing free fatty acids that cause rancidity. The water content and organic nutrients in the oil also create an environment where bacteria can grow, which further accelerates rancidity. Refined oil does not have this problem because the refining process removes the enzymes, water and organic material, leaving nothing to cause deterioration. This is why refined oil can sit on a shelf for a year or more while cold pressed oil needs to be used within a few months and stored carefully.
Cold pressed oil is not recommended for deep frying. Deep frying happens at around 180 degrees Celsius for extended periods of 15 to 30 minutes or more. Cold pressed oil is extracted at below 60 degrees and its nutrients, including the antioxidants that protect against free radical damage, begin burning off well before 180 degrees. Once the antioxidants are depleted, the oil oxidizes rapidly at high temperature and produces significant free radicals that enter your food. For deep frying, a refined stable oil with high heat tolerance, or better yet desi ghee or coconut oil which have 90 percent stable fatty acids, is the better choice.
Kachi ghani is the traditional Indian term for cold pressed oil, specifically referring to oil extracted using a wooden ghani or traditional stone press. Kachi means raw or unprocessed and ghani refers to the press. The process is the same as cold pressed extraction, keeping temperatures below 60 degrees Celsius to preserve nutrients. Kachi ghani oil and cold pressed oil are functionally the same thing. The difference is mainly in terminology. Kachi ghani is the traditional Indian reference while cold pressed is the modern international term. Both refer to oil extracted without excessive heat or chemical processing.
Cold pressed oil can be beneficial for diabetics when used correctly, which means raw or with very minimal short heat exposure. The antioxidants, vitamins and phytonutrients in cold pressed oil support anti-inflammatory responses in the body, which is valuable for diabetics who have elevated chronic inflammation as a baseline. However, using cold pressed oil for sustained high-heat cooking is counterproductive for diabetics because the antioxidants burn off and the oil oxidizes, adding more inflammatory compounds to the food. The right approach for diabetics is to use cold pressed oil raw as a nutritional supplement while using stable cooking fats like desi ghee, coconut oil or palm oil for actual cooking.
Refining oil removes nutrients but does not make the oil harmful in itself. Refined oil is essentially pure fat with a neutral taste and no nutritional extras. The risk with refined oil comes from two sources. First, if the base oil used for refining is high in poly-unsaturated fat, like sunflower or soybean oil, the refined oil still oxidizes significantly under Indian cooking temperatures and produces free radicals, just like cold pressed sunflower oil would. Second, some cheaper refining processes may leave chemical residues though regulated producers follow safety standards. The main issue is not that oil is refined, but that the wrong type of base oil gets used. A refined coconut oil or refined groundnut oil is considerably safer for cooking than either cold pressed or refined sunflower oil.
For tadka where heat exposure is very brief, 30 seconds to a minute of high flame followed immediately by adding water or vegetables, cold pressed oil is fine and actually beneficial. The antioxidants in cold pressed oil can cope with this short duration heat exposure and neutralize the small amount of free radicals generated. After the brief sputtering of spices the oil temperature drops quickly once vegetables and liquid are added. For this specific cooking step, cold pressed mustard oil, sesame oil or groundnut oil all work well and give you both the flavour and partial nutritional benefit. The problem begins when the oil is in sustained contact with heat for longer periods.
Cold pressed for raw nutrition. Heat-stable fats for cooking. The right oil for the right job.
