What if nutrition labels told people exactly what calories meant, in practical terms? A bottle of Coke could dole out specific exercise requirements. The calories herein, it might say, are the equivalent of a 50-minute jog. The decision to drink the Coke then becomes, would you rather spend the evening on a treadmill, or just not drink the soda?
Some would say that's a joyless, infantilizing idea. The implication that people can't understand calorie counts is unduly cynical. Have a Coke and a smile, not a Coke and a guilt-wail. Others would protest on grounds that it's impossible to make this kind of exercise requirement universal to people of all ages, body sizes, and levels of fitness. Everyone burns calories at different rates. But Sara Bleich, an associate professor at Johns Hopkins Bloomberg School of Public Health, is not among these people. She describes these labels as her dream.
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