The End of the Calorie

For most of us, the calorie is just a number on the back of the
packet or on the display at the gym. But what is it, exactly? And
how did we end up with this one unit with which to measure our
food? Is a calorie the same no matter what type of food it comes
from? And is one calorie for you exactly the same as one calorie
for me? To find out, we visit the special rooms scientists use to
measure how many calories we burn, and the labs where researchers
are discovering that the calorie is broken. And we pose the
question: If not the calorie, then what?   Learn more about
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