That's bullshit. First, what energy are we talking about? Earth does not "generate" energy, that's not at all how it works. Second, let's do some motherfucking math: 238900 miles between Earth and the Moon (on average), now double it for the back-and-forth part. If you go 20 miles a day, you'll need a bit more than THIRTEEN CENTURIES to make it. The real origin is Guess How Much I Love You by Sam McBratney. Summary: the kid says "I love you up to the moon!", the father is like "wow, that's really far", and then responds "well, I love you to the moon and back, you little piece of shit" (the last 5 words are not in the original work).
Oh, sorry, the energy generated by the human heart. That's about 1% of the energy in a gallon of gasoline. So, if you rely on this energy alone to ride a truck to the moon and back, that's more like a hundred centuries you'll need, if my orders of magnitude are right. Which makes this picture even worse.
Even if your heart used 100% of the calories you took in each day, there's no way that 1500 to 3500 cal could drive a truck even a fraction of a mile. The limit to the amount of energy expended by the heart has to be from food energy, because you can't take in energy in any other Way...we don't have photosynthesis, for example.
The heart may pump X gallons of blood each day, which is equivalent to something else, but the energy part doesn't make sense.
The heart may pump X gallons of blood each day, which is equivalent to something else, but the energy part doesn't make sense.