Science Friday
Science Friday

Recall rodeo: A food safety update + Why cars are catching fire

Food recalls abounded this summer, but was it unusual? Plus, why some modern cars burst into flames, even when turned off.

Featured Speakers

Brian Ronholm GuestJason Torchinsky Guest

Topics Discussed

Episode Summary

Executive Summary: The episode examines two recall-heavy consumer safety issues: food recalls and parked car fire recalls. Food-safety expert Brian Ronholm argues recall counts are usually flat over time, but high-profile incidents and a Cyclospora spike make 2024-2025 feel worse. He says chronic underfunding, delayed traceability rules, and weak prevention systems have made food oversight less stable. Later, car journalist Jason Torchinsky explains why modern vehicles can catch fire while parked: they are never fully off, leaving powered systems that can short, overheat, and, in EVs, trigger thermal runaway.

Main Topics: Food recalls feel worse than they are (Priority: 5/5): Ronholm says recall volume and outbreak patterns are generally steady over time, but repeated branded recalls create a stronger public impression of crisis. Cyclospora and illness counts (Priority: 5/5): The summer Cyclospora outbreak stands out because illnesses reached unusually high levels, making this year look worse in public-health data. Weaknesses in the food-safety regulatory system (Priority: 5/5): Funding cuts, fewer inspectors, reduced lab and surveillance capacity, and delayed traceability rules are portrayed as structural problems that undermine prevention. Voluntary recalls and corporate messaging (Priority: 4/5): Ronholm is skeptical of company recall language, arguing firms often resist regulators before issuing 'voluntary' recalls and then frame them as cautionary measures. Food safety should be preventive, not reactive (Priority: 4/5): The conversation emphasizes that identifying contaminated products is useful, but the real goal should be preventing contamination and outbreaks before they happen. Why parked cars catch fire (Priority: 5/5): Torchinsky explains that modern vehicles remain electrically active even when shut off, which can allow shorts, sparks, and fires to occur while parked. EV fires and thermal runaway (Priority: 4/5): Battery fires are described as especially dangerous because once thermal runaway starts, temperatures can keep rising and the fire can reignite.

Key Arguments: Food recall frequency is largely consistent year to year; the public perceives an increase because several high-profile recalls happen close together. Cyclospora is an anomaly because illness counts can reach five digits, which is rare for foodborne outbreaks. Food recalls often involve recurring categories such as pathogens, foreign material, and metal shards, not a single new failure mode. Company recall statements are often defensive public relations, not purely voluntary acts; regulators usually pressure firms into action. The food-safety system functions like a Jenga tower: cuts to surveillance, inspections, testing, and research reduce stability and resilience. Traceability would reduce outbreak size by helping investigators identify sources and remove contaminated product faster, but the rule has been delayed for years. Food safety policy should prioritize prevention rather than relying mainly on post-incident recalls. Modern cars are not truly off when parked because keyless systems, security features, and electronics stay powered, creating fire risk. EV fires differ from gas-car fires because battery thermal runaway can be difficult to extinguish and may reignite. Automotive complexity and packed components increase the likelihood that a small electrical or fluid fault becomes a fire risk.

Data Points: Cyclospora illnesses: more than 18,000 - Brian Ronholm cites the summer Cyclospora outbreak as an unusually large illness event. Traceability rule delay: 17 years after the original law was passed - FDA's traceability requirement, created in the 2011 Food Safety Modernization Act, is now slated for July 2028. Food Safety Modernization Act year: 2011 - The traceability provision was part of the FSMA passed in 2011. Foreign product inspections: less than 1% - Ronholm says less than 1% of foreign products get inspected when they come through. Recall/ outbreak trend: fairly flat with little fluctuations - Ronholm describes long-term food recall and outbreak data as mostly stable over time. FDA/CDC capacity loss: cuts to inspectors, laboratory capacity, surveillance, investigations, and research - He lists multiple oversight functions weakened by budget and staffing reductions. Parked car fire recalls: more than a million and a half cars - The car segment references 2025 recalls affecting Jeep, Kia, and other models. Daily driver example: 29 horsepower - Torchinsky uses his old Citroën to illustrate a simpler, less electronically complex car.

Pivotal Quotes: "It definitely feels like it when you consider all of the recalls that you just outlined. But really, for food safety recalls and outbreaks, when you look at data over time, it tends to be fairly flat with little fluctuations." — Brian Ronholm: Explaining why this summer seems recall-heavy despite long-term trends being relatively steady. "A lot of us in the consumer group community think of the food safety regulatory system as kind of a Jenga tower." — Brian Ronholm: Describing how budget cuts and capacity losses destabilize food-safety oversight. "Modern cars are never really off." — Jason Torchinsky: Summarizing why parked vehicles can still experience electrical faults and fire.

Implications: Listeners should expect more visible recalls when outbreaks involve big brands, but not assume food is suddenly much less safe. The bigger issue is chronic underinvestment in prevention and traceability. For cars, convenience and complexity increase parked-fire risk, especially in electrified vehicles.

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