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Prairie Fare: Don’t Fall Prey to the 5-Second Rule

Julie Garden Robinson photo.JPG Julie Garden Robinson photo.JPG
If you drop food on the floor, toss it in the trash.

By Julie Garden-Robinson, Nutrition Specialist

NDSU Extension Service

“Would you like pancakes today?” my 4-year-old asked as I entered our living room.

“Sure, that would be nice. What kind of toppings do you have?” I asked.

“Today we have blueberries, raspberries and strawberries,” she noted as she pointed to an imaginary menu on the wall.

“I’ll have two pancakes with blueberries,” I said.

“We’re all out of blueberries,” she announced.

“Okay, I’ll have raspberries,” I said.

“The raspberries fell on the floor. They’re dirty. Really, really dirty!” she exclaimed, wrinkling her nose.

“When was the last time this restaurant was inspected, anyway?” I asked.

“You can have strawberries,” she said, ignoring my question.

“They didn’t fall on the floor, did they?” I asked.

She grinned and left the room to get my food. I’d have to say those were the best imaginary pancakes and strawberries I ever had.

I was happy to hear that my young daughter had not fallen prey to the “five-second rule.” According to this often-quoted rule, you have a few seconds to pluck food from the floor before it becomes contaminated. Think again.

A few years ago a high school student from Chicago put the rule to the test during an internship at an Illinois university. She surveyed people and learned that women were more likely to eat food that fell on the floor. She also learned that cookies and candy were more likely to be retrieved than vegetables. Imagine that.

She sterilized ceramic tiles, inoculated the tiles with E. coli and then dropped candy or cookies on the tiles. The bad news for food retrievers: Cookies and candy instantly picked up bacteria.

In another test of the famous rule, Clemson University researchers considered the bacteria-transferring properties of several types of flooring, including carpet, wood and tile. The materials were inoculated with salmonella and allowed to stand 24 hours to see if bacteria would survive. The carpet retained the most bacteria, but all the materials retained thousands of bacteria per square centimeter of flooring material.

The researchers dropped bologna and bread on the contaminated flooring material. Within five seconds, the food picked up thousands of bacteria.

Yes, the food that was on the floor longer picked up more bacteria, but don’t take that as evidence to retrieve your cookies, sandwiches or other foods. For some types of bacteria, only a few cells can make you sick.

As we’ve learned from spinach and lettuce recalls, washing doesn’t always get rid of pathogens (disease-causing organisms) on produce. The best advice: Don’t take chances. If you drop food on the floor, toss it in the trash.

Cross-contamination is the transfer of harmful bacteria from surfaces to food or from one food to another. Cross-contamination is one of the leading causes of foodborne illness in the U.S. Consider these tips from the U.S. Department of Agriculture:

  • Use hot, soapy water and paper towels or clean cloths to wipe up kitchen surfaces or spills. Sanitize kitchen surfaces with a solution of 1 tablespoon of chlorine bleach per gallon of water (less than 1 teaspoon per quart). Wash cloths in the hot cycle of your washing machine.
  • Use clean cutting boards. Use one cutting board for fresh produce and a separate one for raw meat.
  • Separate meat, poultry and seafood from other foods in your shopping cart and in your shopping bags. Whenever available, place meat packages in the plastic bags before placing them in your cart.
  • Keep raw meat, poultry and seafood in containers or sealed plastic bags on the lowest shelf of your refrigerator to help prevent their juices from dripping on other foods.

Here’s an easy pancake recipe to enjoy with strawberries, blueberries or raspberries.

Buttermilk Pancakes

2 c. buttermilk (or substitute reconstituted dry buttermilk)

2 eggs, beaten

1 tsp. salt

1 tsp. baking soda

2 tsp. baking powder

2 Tbsp. sugar

1 3/4 c. all-purpose flour

1 1/2 Tbsp. butter or margarine, melted

Preheat griddle to 375 degrees. Mix buttermilk and eggs together. In separate bowl, stir dry ingredients together (or use a sifter). Stir in buttermilk and egg mixture. Add melted butter and mix. Drop from ladle onto hot griddle, cooking each side about two minutes or until light brown.

Makes four servings. Each serving has 360 calories, 10 grams (g) of fat, 55 g of carbohydrate and 20 percent of the daily recommendation for calcium.

(Julie Garden-Robinson, Ph.D., L.R.D., is a North Dakota State University Extension Service food and nutrition specialist and associate professor in the Department of Health, Nutrition and Exercise Sciences.)

NDSU Agriculture Communication

Source:Julie Garden-Robinson, (701) 231-7187,
Editor:Rich Mattern, (701) 231-6136,
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