Is the seed-oil panic changing what chains fry in?

If you've been on American social media in the last three years, you've probably encountered the argument that "industrial seed oils" — soybean, canola, corn, sunflower, and similar refined vegetable oils — are the hidden cause of modern metabolic disease. The argument comes from a mixed coalition of biohackers, functional-medicine writers, Instagram-adjacent nutritionists, and an increasingly mainstream wellness audience. It reached a kind of crescendo in 2024, as beef tallow became a kind of cultural shibboleth for "real food" and seed oils became the bad guy.

At Frypedia, we don't take a position on the scientific question. The underlying nutrition evidence is genuinely contested, and chains should not be choosing cooking oils based on internet discourse anyway. But we do have a privileged vantage point on one related question: are fast-food chains actually changing what they fry in, in response to this cultural moment?

Short answer: yes, but rarely, and the pattern is interesting.

The one definitive switch.

Steak 'n Shake switched from a soybean oil blend to 100% beef tallow in January 2025, with rollout completing by late February. This was announced publicly, framed explicitly in terms of "real food" positioning, and accompanied by social-media communications that leaned hard on the nostalgia angle ("we still cook our fries in beef tallow like the great American diners of the 1950s"). The business context was also clear: Steak 'n Shake had been financially pressured for years, and needed a differentiator that wouldn't require menu redesign or capital expenditure. Beef tallow fit perfectly — a recipe change that communicated as a values statement.

This is, as best we can establish, the only major fast-food chain that has switched from vegetable oil to animal fat specifically in the 2023-2026 seed-oil-panic window. Bojangles, Portillo's, and the smaller chains that use tallow have been doing so for decades — the 1990 McDonald's reversal never fully propagated. Smashburger chose tallow at founding in 2007, well before the current cultural moment.

Steak 'n Shake, then, is the one clear case of an established chain moving its fry oil because of the seed-oil cultural shift. Whether it represents a trend or a one-off is the open question.

The quieter pattern: no chains have gone the other direction.

Five years ago, we might have expected some chains to announce a switch to a more-refined modern cooking oil — maybe high-oleic sunflower, maybe non-GMO rice bran, maybe something branded as "clean" or "heart-healthy." Hopdoddy has been doing this with rice bran since founding (2010), and it's arguably the purest example of the "modern oil, clean provenance" positioning.

But no established chain in our dataset has announced a similar switch in the last five years. Elevation Burger, a natural candidate for such an announcement, has been using olive oil since founding — not as a recent switch. Five Guys and Chick-fil-A have been on peanut oil for decades. In-N-Out and Dick's Drive-In have been on sunflower oil for generations.

The chains that might make a "clean oil" announcement are largely chains that made those decisions a long time ago, when the decision wasn't as culturally loaded. In 2024-2026, no new chain has emerged saying "we cook in [specific modern oil] because it's healthier than soybean oil," even though a reasonable nutritional case could be made for several options.

What we're watching.

Our best guess for the 2026-2028 window: one or two more established chains will switch to beef tallow, framed as a brand refresh. They will be chains with some existing cultural permission to make the switch — diners, classic-format chains, or regionals with a nostalgia story to tell. Not McDonald's. Not Burger King. Not Wendy's. Those are too big and too exposed to health-advocate pushback to risk a public tallow reversion.

The smaller regionals and the diner-format chains are the ones to watch. A plausible list of candidates: Culver's (Midwest diner vibe, currently on canola), Whataburger (Texas institution, currently on soybean), White Castle (diner-era origin, but historically vegetable-oil focused, probably unlikely), any of the regional BBQ chains. None have announced anything. All are chains where a tallow switch would fit the brand without requiring operational reinvention.

What this means for the Cold Eight.

If the tallow trend accelerates, the Cold Eight may become the Cold Seven, or the Cold Six, within a few years. Not because chains will switch from clean oils to tallow — that's harder to imagine — but because a chain that adopts tallow is, by definition, no longer eligible for the Cold Eight. A chain switching from shared-fryer vegetable oil to shared-fryer beef tallow doesn't change its Cold Eight status (it was already out). But a chain switching from dedicated-fryer vegetable oil to tallow would be a major event.

At the moment, none of the Cold Eight chains are plausible candidates for a tallow switch. Five Guys, Chick-fil-A, In-N-Out, Hopdoddy, P. Terry's, Dick's Drive-In, Mission BBQ, and Elevation Burger are all culturally and operationally committed to their current fryer philosophies. But this is worth watching — the Cold Eight is a snapshot, and a snapshot can shift.

Our commitment stays: any chain that changes its fry oil gets updated on Frypedia within forty-eight hours of confirmation. The seed-oil debate will resolve itself, or not, over the next decade. In the meantime, we'll be here, cataloguing the actual fryer of every actual chain, one chain at a time.