Very few nutrition debates generate more heat than the one about seed oils. Advocates on one side describe them as among the most harmful substances in the modern food supply. Institutional nutrition science largely continues to recommend polyunsaturated vegetable oils as preferable to saturated fats. Neither camp is being entirely straight with you.
Angela Svonavec holds a Doctorate in Naturopathy and has spent years reading the evidence on dietary fat with clinical attention. Her position is unambiguous: she is highly opposed to seed oils. They are highly inflammatory, oxidatively unstable, and nearly impossible to source free of the GMO seeds, pesticides, and industrial chemical inputs used to grow and process them. Animal-source fats are far easier to obtain clean.
The Concerns Are Legitimate, Not Fringe
The criticism of seed oils that holds up scientifically centers on two issues. The first is the omega-6 to omega-3 ratio. Seed oils are high in linoleic acid, an omega-6 polyunsaturated fatty acid, and they have pushed the dietary ratio in most Western countries from something near 4:1 toward 15:1 or higher. That shift corresponds with the rise of chronic low-grade inflammation as a background condition in Western populations.
The second issue is oxidative stability. Polyunsaturated fatty acids are chemically reactive under heat, light, and air. Seed oils, which are produced through high-heat industrial processing, already contain oxidized compounds before they reach the kitchen. Cooking with them generates more. Oxidized lipids are biologically active in ways that their unoxidized counterparts are not.
These are not fringe concerns. They are areas of active research with legitimate scientific weight.
The Mainstream Position Has Points Too
Controlled trials comparing polyunsaturated fat to saturated fat do generally show cardiovascular benefit favoring polyunsaturated fats, particularly against trans fats or highly refined saturated sources. The evidence on olive oil, a monounsaturated fat with a very different production process, is consistently positive. The problem is that much nutrition research treats “vegetable oils” as a single category when the category contains meaningfully different compounds.
Angela Svonavec’s reading of the evidence: not all oils are equivalent, processing matters, stability matters, and the comparison point matters. Replacing butter with soybean oil produces different outcomes than replacing soybean oil with beef tallow.
The Kitchen at Shamrock Made a Decision
Shamrock Whisky and Cigar Bar does not use seed oils. The kitchen cooks in beef tallow. Angela Svonavec did not make that decision because seed oil avoidance is fashionable. She made it because a stable saturated fat with centuries of culinary use requires no justification that an industrially processed, oxidatively unstable oil would need to earn.
The evidence is clear enough. Seed oils are out of the Shamrock kitchen and have been out of Angela Svonavec’s home for years. She considers the choice straightforward.