Tests of more than 700 preschoolers' packed lunches found that fewer than 2 percent of the meats, vegetables and dairy products were cool enough to be safe, according to a U.S. study.
One in six U.S. residents gets food poisoning every year, according to the U.S. Centers for Disease Control and Prevention (CDC), but it is unclear how many cases are caused by lukewarm sack lunches.
The study by Fawaz Almansour, a doctoral student at the University of Texas in Austin, was the first to check how the food that children take to school is doing in terms of health about ninety minutes before they eat it.
"It was a shock when we discovered that more than 90 percent of the perishable items in these packed lunches were kept at unsafe temperatures," Almansour said.
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