Seed oils, scored in context.
Seed oils get discussed as if there is one correct verdict: always fine, or always a problem. Our model does not use a blanket rule. It scores an oil by its type, its degree of processing, how the oil is used in the product, how much of the product it represents, and the food it appears in.
Our framework: context matters
We evaluate a product's oil along five dimensions together. A product is never scored down for containing a seed oil by itself.
- Type of oilDifferent oils have different processing profiles and nutrient composition. We evaluate each on its own characteristics, not as one interchangeable category.
- Degree of processingA highly refined oil is treated differently from a less processed oil. Refining changes the final ingredient and can reduce naturally occurring compounds.
- How the oil is usedAn oil used in a fried product is scored differently than the same oil used in a product that is not fried.
- How much it representsAn oil listed among the first few ingredients carries more scoring weight than an oil used in a trace amount.
- The full food matrixWe do not score an oil on its own. We score it within the full product, whether that product is minimally processed, ultra-processed, fried, a snack, or made at industrial scale.
What we weight most
The largest score deductions go to the categories with the clearest evidence behind them.
Partially hydrogenated oils and trans fats
These carry our largest deduction. Regulatory and research consensus treats artificial trans fats as an outlier ingredient, not a borderline case.
Fried and industrial refined-oil use
A refined seed oil used in deep frying, fried snacks, or a likely repeated-heat industrial process carries a larger deduction than ordinary culinary use. The processing environment is more aggressive.
Primary fat in an ultra-processed food
When a refined seed oil is the primary fat source in an ultra-processed product, the oil is rarely the only factor. Our model weights it alongside the rest of the formulation.
What we do not do
We do not treat every seed oil as an automatic failure. A refined seed oil used in a non-fried product still lowers a score, usually by a smaller amount. That reflects a lower-preference fat choice, not an automatic disqualifier.
We also do not treat every omega-6 source the same way. Whole foods such as nuts, seeds, tahini, and seed butters have a different nutrient structure than an extracted industrial oil, and we evaluate them in that context. Omega-6 content alone is not enough to trigger the deduction we apply to refined oils.
What we favor
Extra-virgin olive oil and avocado oil are usually scored more favorably. Both fit a lower-processing, whole-food-oriented pattern more consistently than a typical refined seed oil.
That does not make every other oil an automatic problem. We rank oils by quality and context, evidence-informed rather than trend-driven.
Evidence summary
This framework reflects the balance of independent research and umbrella reviews on seed oils, refining, and frying, not a single study on either side of the debate. Where the evidence is strong, such as the case against artificial trans fats, we weight it heavily. Where it is preliminary, we say so instead of treating it as settled. Our full evidence standards are on the Science page.
Reviewed: August 2026. We revisit this page as new research and formulation data become available.
What the score means
What the score does
The seed-oil portion of a score reflects oil type, processing degree, how the oil is used in the product, how much of the product it represents, and the food matrix it sits within. It is one input among several that make up a product's overall food-quality score.
What it does not mean
The score is not a diagnosis and not medical advice. It does not measure what an oil does inside your body, only how the product compares against an evidence-informed food-quality standard.
Three examples in practice
The same ingredient can score very differently depending on the amount, the processing, and how it is used.
A trace amount in a seasoning
A spice blend lists a refined seed oil as a carrier, low on the ingredient list, in a product that is not fried. The deduction is small because the amount is minor and the food matrix is not a fried or ultra-processed one.
A primary fat in a fried snack
A fried snack lists a refined seed oil as its primary fat, prominent on the ingredient list, heated during frying. Type, processing, and use combine here, so the deduction is larger.
Reheated or reused frying oil
A product description or process note indicates the frying oil was reheated or reused across multiple batches. Repeated heating changes the oil's chemistry, and our model applies an additional deduction in that context.
Going deeper
This page covers one ingredient category in detail. The full scoring method, our evidence standards, and what we are still uncertain about are on the Science page.
