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Q
Walking Off a Burger?

I recently saw a poster that showed how much exercise (walking) it would take to burn off the calories in a soft drink. I thought that was really useful information and decided to buy a bottle of water instead of the soda. Are you aware of these posters? Are they widely available?

A
Answer (Published 6/10/2013)

You may be referring to posters distributed in New York City in late 2011 to inform people how many calories they would be consuming with certain sugary drinks. In addition to the calorie counts, the posters listed the distance one would have to cover to walk off a 20-ounce soda.

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More recently, researchers from the University of North Carolina conducted an online survey to examine the responses of 802 participants to various menus. One of the menus listed only calorie counts per item; another listed calories plus information on the time it would take to walk them off; a third showed the calories plus the actual distance you would have to walk to burn them off. The calculations listed in the menus were based on the time it would take for a 160-pound adult walking at a rate of 30 minutes per mile, which should not be challenging to anyone who is in average shape. For example, the time to burn off a 250-calorie burger was 78 minutes, the distance 2.6 miles.

The researchers found that people who viewed menus without calorie counts ordered meals averaging 1,020 calories. Those who saw how long it would take to walk off the calories ordered food averaging 826 calories and those who saw menus that provided information about how far they would have to walk to burn off the calories ordered meals averaging 927 calories. The study was published in the March, 2013, issue of Appetite.

Providing information on how much activity is required to work off calories in foods apparently can make a difference. A study from Johns Hopkins, published in February 2012, in the American Journal of Public Health, found that posting information about how long it would take to work off the calories in a soda or a bottle of fruit juice (50 minutes of running) reduced the odds that teenagers would buy the drinks. The signs were posted in corner stores in a low-income Baltimore neighborhood. Signs that merely showed the calorie counts had no apparent effect on purchasing decisions.

If you’re interested in knowing how much exercise it takes to burn off a set amount of calories, you can find any number of online calculators that will give you calories burned per hour for many different activities for someone of your height and weight.

Andrew Weil, M.D.

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