Home Food Handling Review: Redmond & Griffith (2003)
What Really Happens in Home Kitchens: The 2003 Review
The study: Redmond EC, Griffith CJ. (2003). Consumer food handling in the home: a review of food safety studies. Journal of Food Protection, 66(1), 130–161.
Self-reported surveys say one thing; cameras in kitchens say another. Redmond and Griffith reviewed the body of consumer food-handling research — including observational studies that watched people cook — and the picture was consistently worse than what people claimed about themselves.
What the observational studies caught
Inadequate handwashing (too short, no soap, wrong moments). Cross-contamination via hands, cutting boards, and utensils moving between raw and ready-to-eat foods without cleaning. Thermometer use rare; doneness judged by color and “experience.” Refrigeration abused — leftovers left out, fridges too warm, thawing on counters. The review documented a systematic optimism bias: consumers rated their own practices far safer than observers did.
Why this review matters for professionals
Two reasons. First, it validates designing for real behavior: if observational studies show people don’t wash produce properly, your produce safety can’t depend on them doing so. Second, it’s a masterclass in why self-report data needs skepticism — a lesson that applies to employee food safety questionnaires too. The published record shows plants survey workers about handwashing compliance and celebrate the results; the observational literature says go watch instead. What people say and what cameras see are different datasets. Trust the cameras.
The review that mapped home risk
Redmond and Griffith’s 2003 review — 130–161 in the Journal of Food Protection, 31 pages — remains the most comprehensive synthesis of home food-handling studies. Its achievement was organizational: dozens of observational studies, surveys, and microbiological investigations arranged into the complete picture of domestic food safety failure. Cross-contamination, inadequate cooking, temperature abuse, poor hygiene — the review documented each with the accumulated evidence, creating the reference that subsequent work cites and builds on.
The review’s most cited contribution is the hierarchy of home risk behaviors — which failures matter most. Cross-contamination during raw poultry preparation, undercooking, and the temperature abuse of leftovers emerge as the big three, supported by both the observational frequency and the microbiological plausibility. This prioritization matters because consumer messaging can’t cover everything; the review tells communicators where the limited attention should go.
The methodological critique embedded in the review is equally valuable. Self-report versus observation (the gap), the Hawthorne effect in observed kitchens (people behave better when watched — so the observed failures understate the real ones), the sampling biases (who volunteers for a kitchen observation study?). These caveats mean the documented failures are the floor, not the ceiling — home kitchens are worse than the studies show. The review’s honest conclusion: the home is a significant source of foodborne illness, the behaviors are well documented, and changing them remains the unsolved problem.
The review’s conceptual contribution
The Redmond-Griffith review’s conceptual contribution — the home food handler as the risk factor, the domestic kitchen as the epidemiological setting, the consumer behavior as the intervention target — reframed the home from the private space to the public-health space. The reframing justified the consumer food safety research programs that followed: the home was no longer the epidemiologist’s blind spot but the intervention’s frontier. The conceptual shift preceded the methodological one.
Source: Redmond EC, Griffith CJ. (2003). Consumer food handling in the home: a review of food safety studies. Journal of Food Protection, 66(1), 130–161.