The Daily Harvest Crumbles Outbreak (2022): Tara Flour and the Illness Nobody Could Explain

In the spring of 2022, customers of Daily Harvest — the venture-backed, direct-to-consumer meal company beloved by wellness-minded millennials — began reporting something frightening: violent gastrointestinal illness, and in many cases, liver injury severe enough to require hospitalisation and gallbladder removal. The common thread was French Lentil + Leek Crumbles, a plant-based meat alternative. The FDA ultimately received nearly 400 adverse event reports. The suspected culprit was tara flour, an obscure ingredient few in the industry had ever used — and the exact toxic agent was never identified.

The product and the people affected

Daily Harvest’s French Lentil + Leek Crumbles were a frozen plant-based product marketed as a healthy, sustainable meat alternative, shipped directly to subscribers’ homes. The customer base was health-conscious, affluent, and vocal on social media — which meant the outbreak played out in public, in real time.

At a glance:

The clinical picture was unusual for a foodborne outbreak: alongside severe nausea, vomiting, and abdominal pain, many patients showed elevated liver enzymes and liver injury — a pattern more suggestive of a chemical toxin than a bacterial pathogen.

What happened

The first reports appeared in April and May 2022 on social media and in Daily Harvest’s own customer feedback channels: subscribers describing extreme stomach pain, vomiting, fevers, and dark urine after eating the crumbles. Some were hospitalised; a number underwent cholecystectomy (gallbladder removal) after presenting with gallbladder-like symptoms. The company’s initial response — including an email to customers suggesting the issue might be “digestive discomfort” from the product’s high fiber — was widely condemned as dismissive and became a case study in how not to handle a food safety crisis.

In June 2022, Daily Harvest voluntarily recalled the crumbles and advised customers to discard them. The FDA opened an investigation, and the company’s own testing pointed to tara flour — a protein- and fiber-rich powder milled from the seeds of the tara tree (Caesalpinia spinosa), native to Peru — as the suspect ingredient. Tara flour had been used as a novel food ingredient with little history of consumption in the products and quantities at issue.

But here the investigation stalled in a scientifically fascinating way. Extensive testing of the tara flour and the finished product failed to identify a definitive toxic agent. No known mycotoxin, heavy metal, pesticide, or microbial pathogen explained the liver injury pattern. The FDA’s assessment, reported in 2023, was that tara flour was the likely vehicle — the epidemiology was strong — but the specific compound responsible for the toxicity remained unknown. Hypotheses included naturally occurring compounds in tara seeds (such as tannins or other antinutritional factors) concentrated by the milling process, or an uncharacterised contaminant.

Daily Harvest faced a wave of lawsuits from injured customers. The episode became a landmark in the novel-ingredient debate: tara flour had entered the food supply through the GRAS (Generally Recognized as Safe) self-determination pathway with limited safety data for its actual use, and the outbreak exposed how thin that safety basis could be.

Timeline

• April–May 2022 — Customer reports of severe GI illness and liver injury linked to Lentil + Leek Crumbles surface on social media.
• June 2022 — Daily Harvest voluntarily recalls the crumbles; FDA investigation opens.
• 2022 — Company testing implicates tara flour; 28,000 units confirmed distributed.
• 2023 — FDA assessment: tara flour likely the vehicle; toxic agent unidentified; ~393 adverse event reports received.

Root cause

Investigators found that the illnesses were strongly associated with consumption of the crumbles, and tara flour was identified as the likely vehicle — but the specific toxic agent was never identified despite extensive testing. The root cause, at the level the evidence supports, was the introduction of a novel ingredient (tara flour) into a widely distributed consumer product without an adequate safety assessment for its actual conditions of use. Whether the toxicity came from an inherent compound in tara seeds, a processing-created artifact, or an uncharacterised contaminant remains unknown — which is itself the lesson: the safety dossier for the ingredient was insufficient to rule out harm before it reached 28,000 households.

Regulatory and business outcome

Daily Harvest faced extensive civil litigation and lasting brand damage; the company’s crisis communication failures compounded the harm. For regulators and the industry, the case became the leading argument for reform of the GRAS self-determination process: an ingredient with minimal consumption history and limited toxicological data had reached mass market through a pathway that required no pre-market FDA review. The FDA has since increased its scrutiny of novel plant-protein ingredients, and the case is routinely cited in policy debates about GRAS reform.

Lessons for food businesses

1. Novel ingredients need novel-ingredient safety work. “Plant-based” and “natural” do not equal safe. Tara flour’s limited history of use meant its risks were uncharacterised — characterise them before launch, with toxicology appropriate to the exposure.
2. The GRAS self-determination pathway is a responsibility, not a loophole. If you self-affirm GRAS status, your safety dossier must be genuinely robust — because when harm occurs, its thinness becomes the story.
3. Liver injury is a red flag for chemical toxicity. Train your complaint-handling teams to recognise non-classic patterns: when consumers report jaundice, dark urine, or gallbladder symptoms, escalate immediately — do not suggest fiber.
4. Never minimise in a crisis. Daily Harvest’s early “digestive discomfort” messaging became Exhibit A in the public’s case against the company. Acknowledge, recall, investigate — in that order.
5. Direct-to-consumer means direct-to-social-media. DTC brands face outbreak publicity in real time, unfiltered. Your crisis plan must assume customers will publish their symptoms before you finish your investigation.
6. Unknown toxic agents are the hardest failures. When testing cannot identify the agent, you cannot set a specification to prevent recurrence. The only defence is pre-market safety assessment thorough enough to catch the unknown.
7. 28,000 units is mass exposure. Novel ingredients should be introduced in limited, monitored rollouts — not blasted to tens of thousands of subscribers at once.

Sources

• “FDA says tara flour was likely behind illnesses tied to Daily Harvest crumbles” — Food Safety News, 2023. https://www.foodsafetynews.com/2023/02/fda-says-tara-flour-was-likely-behind-illnesses-tied-to-daily-harvest-crumbles/