If you’ve been strolling down the oil aisle lately, you’ve probably noticed labels like "Cold Pressed" and "Wood Pressed" (also known as Kachchi Ghani or Marachekku). While they both sound healthier than your average refined oil, they aren't exactly the same thing.
Understanding the nuance between them can be the difference between getting "just oil" and getting a nutrient-dense superfood.
1. What is Cold Pressed Oil?
Cold pressing is a broad term for extracting oil without using high heat or chemicals. In a modern industrial setting, this is usually done using a metal expeller.
- The Process: A screw press crushes seeds at low temperatures.
- The Temperature: To be labeled "cold pressed," the temperature must generally stay below 50°C (122°F).
- The Catch: Metal expellers can still generate friction heat. If the speed is too high, the oil can lose some of its delicate antioxidants.
2. What is Wood Pressed Oil?
Wood pressing is actually a specific type of cold pressing. It’s the traditional, ancestral method that uses a wooden mortar and pestle (the Ghani).
- The Process: Seeds are crushed in a wooden vat. Because wood is a poor conductor of heat, it absorbs any friction heat generated during the process.
- The Temperature: It typically stays at room temperature, ensuring the oil’s molecular structure remains completely unaltered.
- The Result: This is the "gold standard" of oils. It retains the original aroma, flavor, and 100% of the nutrients.
Comparison at a Glance
Why Should You Care? (The Health Benefits)
When you choose wood-pressed or high-quality cold-pressed oils over refined oils, you are avoiding:
- Hexane: A chemical solvent used in refining.
- Bleaching Agents: Used to make oil look "clear."
- Trans Fats: Created when oil is heated to extreme temperatures during industrial processing.
Instead, you get an oil rich in Vitamin E, Omega-3 fatty acids, and natural antioxidants that support heart health and skin glow.
Pro Tip: Look for "unrefined" and "undeslimed" on the label. This ensures the oil hasn't been chemically stripped of its character.
Which One Should You Choose?
If you want the absolute purest form of oil that tastes exactly like the seed it came from, Wood Pressed is the winner. However, any Cold Pressed oil is a massive upgrade over the refined, "transparent" oils found in most kitchens.
