From the field to the plate: A critical look at the processing of seed oils

You reach for a bottle of sunflower oil in the supermarket and you might think that it simply contains pressed sunflower seeds. But the journey from the field to your kitchen is often longer and more complicated than you think. In this article, we take a critical look at the processing of seed oils.

The Harvest: The Beginning of the Journey

It all starts in the field. Oilseeds such as sunflowers, rapeseed or soybeans are harvested mechanically. This is where the first problems can arise:

• Pesticides and herbicides can leave residues.
• Genetically modified plants raise questions about sustainability and health.

Extraction: How the oil is extracted

After harvesting, the seeds are cleaned and crushed. Then the actual extraction process begins:

1. Mechanical pressing : High-quality oils are often pressed mechanically. This method is gentler, but produces a lower yield.
2. Chemical extraction : Most commercial oils are extracted chemically, often using hexane - a solvent that raises health and environmental concerns.

Refining: The Controversial Process

After extraction, most seed oils undergo a refining process:

1. Degumming : Removes phospholipids and other substances.
2. Neutralization : Removes free fatty acids.
3. Bleaching : Removes dyes and other unwanted substances.
4. Deodorization : Removes volatile substances and odors.

This process makes the oil more durable and tasteless, but it also removes many natural nutrients and can lead to the formation of harmful trans fatty acids.

Critical points in the processing process

1. High temperatures : During processing, oils are often exposed to high temperatures, which can lead to oxidation and the formation of harmful compounds.
2. Chemicals : The use of chemicals such as hexane may leave residues in the final product.
3. Nutrient loss : Many natural antioxidants and vitamins are lost during refining.
4. Environmental aspects : The intensive processing consumes a lot of energy and produces waste.

What can you do?

• Choose cold-pressed oils : These are processed more gently and retain more of their natural nutrients.
• Pay attention to organic quality : Organic oils are grown without synthetic pesticides and are often processed more gently.
• Do your research : Read labels and research the manufacturing processes of your favorite brands.
• Reduce your oil consumption : Use centuries-old foods such as butter, beef tallow or coconut oil.

Conclusion

The processing of seed oils is complex and not always consumer-friendly. While it improves the shelf life and versatility of the oils, it can also have negative effects on nutritional value and your health.

As a conscious consumer, you can make an impact on your diet and the industry by making informed choices and choosing less processed alternatives. Remember: not all oils are created equal, and sometimes less processing is better for your health.