Every documented fry recipe change, 1955 to today.
Fast-food fries have been through five distinct eras in 71 years — from the beef-tallow standard McDonald's defined in 1955, through the 1990 vegetable-oil switch (with hidden beef flavoring), through the trans-fat panic, the premium-oil branding era, and now the 2024–2025 reformulation era as Steak 'n Shake reverts to tallow and seed-oil discourse mainstreams. 25 events on one horizontal scroll. Cards with room below them open fully by default; cards in dense regions are compact — a at the bottom of a card means there's more text on hover.
McDonald's opens
Ray Kroc opens the first McDonald's franchise in Des Plaines, IL. Fries cook in 93% beef tallow + 7% cottonseed oil — the recipe that defines fast-food fries for the next 35 years.
Wendy's founded
Dave Thomas opens the first Wendy's in Columbus, OH. Square patties, crinkle-cut fries, beef tallow. Industry standard at the time.
Sokolof founds National Heart Savers Association
Omaha industrialist Phil Sokolof survives a heart attack and founds the NHSA to attack saturated-fat use in fast food. The campaign that will eventually move McDonald's begins.
Full-page ads attack McDonald's
Sokolof spends $2M of his own money on full-page ads in the NYT, WSJ, and other major papers headlined "The Poisoning of America." McDonald's, Burger King, and Wendy's named directly.
McDonald's switches to vegetable oil
Under sustained pressure, McDonald's completes the switch from beef tallow to 100% vegetable oil in July. To maintain the taste, "natural beef flavor" is added to the par-frying step — a detail not publicly disclosed.
The Tallow Reversion →Industry follows
Burger King, Wendy's, and Hardee's switch to vegetable oil within 18 months of McDonald's. The beef tallow era ends industry-wide.
The hidden-beef discovery
Seattle attorney Harish Bharti files a class action after discovering McDonald's "vegetarian" fries contain beef-derived natural flavoring. Vegans, vegetarians, Hindus, and Muslims have been unknowingly eating beef for 11 years.
$10M class-action settlement
McDonald's settles for $10M, distributed to vegetarian and Hindu/Muslim advocacy groups. The chain agrees to disclose the natural-flavor source on its website. The fries still contain beef flavor today in the US.
The McDonald's Canada Paradox →Denmark bans trans fats
Denmark becomes the first country to legally restrict industrial trans fats in food — to less than 2g per 100g. Other governments take notice. The pressure on fast-food chains shifts from saturated fat to trans fat.
NYC restaurants restricted
New York City Board of Health passes the first US restaurant-level trans-fat restriction. Chains operating in NYC must comply by July 2008. McDonald's begins the multi-year reformulation in earnest.
California follows nationally
California passes a statewide trans-fat ban for restaurants. Most major chains complete their phase-out around this period — switching from partially hydrogenated soybean and corn oils to refined vegetable blends.
Wendy's Natural-Cut launches
Wendy's launches "Natural-Cut Fries with Sea Salt" — skin-on, hand-cut-style, premium positioning. The first major chain to market the fry itself as a craft product, not just a side.
Chick-fil-A confirms dedicated fryer
Chick-fil-A publicly confirms its Waffle Potato Fries cook in a canola-oil fryer separate from the peanut-oil chicken fryer. Peanut-allergic diners get a permanent green light for fries.
The Cold Eight →"What's in our food" campaign
McDonald's launches a transparency campaign disclosing the ~19 ingredients in its US fries — including dimethylpolysiloxane (anti-foaming agent) and TBHQ (preservative). The reveal goes viral; ingredient-count discourse begins.
In-N-Out 8-state expansion
In-N-Out's footprint hits 8 states (CA, AZ, NV, UT, TX, CO, OR, ID). Hand-cut Kennebec potatoes in dedicated sunflower-oil fryers gain national attention as the dedicated-fryer ideal.
BK Canada reformulates
Burger King Canada launches a reformulated fry that earns Vegetarian Society certification — vegan, no shared fryer with breaded items. US BK does not follow. The two-country split is now visible.
FAT Brands acquires Fatburger; Jollibee buys Smashburger
Two ownership shifts that will matter later: FAT Brands consolidates Fatburger (plus Elevation Burger, Johnny Rockets, others). Filipino conglomerate Jollibee acquires Smashburger. Both moves quietly enable later fry-recipe reformulations.
The FAT Brands Three-Way →COVID disrupts supply chains
Pandemic supply-chain disruption forces several chains to reformulate or switch oil suppliers. Some changes are documented; many are not. The opacity of the era will become a pattern.
FASTER Act adds sesame
Congress passes the FASTER Act, adding sesame as the 9th FDA-recognized major allergen. Effective January 1, 2023. Chains must update allergen disclosures — many add sesame retroactively as ingredient lists shift slightly.
Sesame disclosure live
FDA Top-9 disclosure requirement takes effect. Allergen PDFs across the industry get updated. Frypedia's allergen heatmap captures the resulting state.
The Allergen Heatmap →"MAHA" / seed oil discourse mainstreams
The "Make America Healthy Again" movement amplifies long-running critique of seed oils. RFK Jr. names fast-food vegetable oils specifically. Restaurant chains start fielding seed-oil questions in earnest.
The Seed Oil Panic →Steak 'n Shake announces tallow return
Steak 'n Shake CEO Sardar Biglari announces the chain will switch back to 100% beef tallow for fries — the first major reversion since 1990. Rollout begins late 2024.
Steak 'n Shake completes the switch
By January 2025, all Steak 'n Shake locations are frying in 100% beef tallow. The first chain to fully reverse the 1990 industry move. The Tallow Club gets a fifth member.
The Tallow Reversion →BK adjusts in select markets
Burger King announces formula adjustments in select markets — quiet changes, not branded as reversions. Pattern continues of the US/Canada/UK split.
FAT Brands files Chapter 11
FAT Brands files for Chapter 11 bankruptcy in January 2026, putting Fatburger, Elevation Burger, and Johnny Rockets under restructuring. Fry recipes are operationally locked but the brands' futures are uncertain.
The FAT Brands Three-Way →