Seed Oil Spotter

The seed-oils literature is contested

Two reasonable positions exist:

• The cautious case (Ramsden, DiNicolantonio). Recovered RCT data from the Sydney Diet Heart Study and Minnesota Coronary Experiment showed that swapping saturated fat for linoleic-rich seed oils didn't reduce mortality and may have increased it. The mechanism case rests on oxidized linoleic-acid metabolites.
• The mainstream case (Hooper Cochrane, AHA position). Cutting saturated fat reduces CV events when replacement is polyunsaturated. The food-matrix-matters-more interpretation (Astrup 2020 JACC) is gaining ground but the cautious-replacement position is still defended by major bodies.

We don't take a strong “seed oils are toxic” position. We do take a precautionary stance: when reasonable alternatives exist (olive oil, butter, ghee, lard, tallow), prefer them. When they don't (eating out), accept the exposure rather than obsess.

What we flag and what we don't

We flag the named industrial seed oils: canola/rapeseed, soybean/soy, corn, cottonseed, sunflower, safflower, grapeseed, rice bran. Plus generic terms like “vegetable oil” (almost always a soy/canola blend) and hydrogenated/partially hydrogenated oils.

We don't flag every saturated fat or every refined oil categorically. Palm oil shows up in our list because refined palm is often blended with seed oils, but unrefined palm fruit oil has a different fatty-acid profile. Coconut oil, despite being saturated and refined, isn't a seed oil (it's a fruit oil) and isn't flagged.

Where seed oils actually live

The dominant exposures, in rough order:

• Restaurant cooking. Most US restaurants cook in canola or soybean. Even “healthy” salads come with seed-oil dressings. This is where the volume comes from for most adults.
• Packaged snacks and ultra-processed food. Crackers, chips, cookies, granola bars — almost all use seed oils. The Hall 2019 inpatient trial's 500 kcal/day overconsumption signal partially reflects this.
• Mayo and salad dressings. Standard versions are seed-oil heavy. Brands like Primal Kitchen and Chosen Foods use avocado oil instead.
• Fried foods. Chips, fries, breaded items — all seed oil.
• “Healthy” packaged products. Granola, protein bars, plant- based meat alternatives — most contain seed oils despite the marketing.

Practical replacement guide

• Cooking at home: butter, ghee, olive oil, tallow, lard, coconut oil, avocado oil
• Salad dressings: homemade (olive oil + vinegar) or Primal Kitchen / Chosen Foods bottled
• Mayo: Primal Kitchen avocado-oil mayo, Chosen Foods, or homemade
• Snacks: nuts (whole, not roasted in seed oil — many packaged nuts are), cheese, hard-boiled eggs, fruit, jerky from clean brands
• Restaurants: grilled protein + vegetables; ask for butter where possible (see our restaurant survival guide)