University of Texas researchers tested packed lunches for more than 700 preschoolers and found that fewer than 2% of the meats, dairy and vegetables were at safe temperatures about 90 minutes before lunchtime. The study in the journal Pediatrics said that even though 45% of the lunch bags had an ice pack and 12% were kept in a refrigerator, almost all of the perishable foods still were in the danger zone for developing bacteria that leads to food poisoning.

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