Why Many People Avoid Refined Oil

Refined oils are popular because they look clear, have a neutral smell, and stay stable for a long time. But the way they’re produced is highly industrial, and that’s the main reason many health-conscious customers prefer to avoid them.

There are two major concerns:

1. Solvent extraction (Hexane)

2. High-temperature chemical refining

• 1) What is Hexane and why is it used in refined oils?

  Hexane is a petroleum-derived solvent widely used in industrial oil extraction because it pulls out more oil from seeds than mechanical pressing.

  How solvent extraction works (easy flow)

  Seed flakes → washed with hexane → oil dissolves into “miscella” → solvent is removed by heating/distillation → crude oil goes for refining

  “Does refined oil contain hexane?”

  Food regulators set strict limits. In India, FSSAI specifies that refined oil produced by solvent extraction shall not contain hexane more than 5.0 ppm, and expeller-pressed oil should be free from hexane residues.

  So, compliant refined oils should have very low residual hexane—but many consumers still avoid it for these reasons:

  • It’s a petroleum solvent, used as a processing aid (not something customers expect in daily food)

  • It usually won’t appear on the label, because it’s treated as a processing aid in many regulations, so customers feel there’s less transparency

  • Healthy customers prefer oils made by simple mechanical pressing (seed → press → filter → pack)

• 2) High-temperature refining can create “process contaminants”

  After extraction, crude oil is commonly refined using steps like degumming, neutralization, bleaching, and deodorization.

  Deodorization is the key step

  To remove smell and taste, oils are often deodorized at very high temperatures (around 230–260°C).

  At these temperatures, research and regulators note that certain process contaminants can form, including:

  • Glycidyl esters (GE) – EFSA notes these can form when vegetable oils are heated above 200°C, such as during deodorization

  • 3-MCPD / 2-MCPD esters – linked with high-temperature refining and discussed widely in edible oil safety literature

  This is a strong scientific reason many consumers prefer minimally processed oils:
  cold-pressed oils typically avoid solvent extraction and avoid high-temperature deodorization, reducing the pathways that create these contaminants.

• 3) Refining can strip natural goodness

  • Refining is designed to remove:

    • natural aroma and flavor

    • color compounds

    • some minor bioactive components

    That’s why refined oils are often odorless and neutral—but many people see that as a sign the oil has been “processed too much.”