1.2 grams of fat?

I just climbed the steps to my office on the 10th floor.

Took me about three minutes and I was breathing pretty heavily. Plugged some numbers into Wolfram Alpha and... the energy I expended lifting my body mass up ten storeys against earth's gravitational attraction is equivalent to... 10 kilocalories or "~~ 1.2 × metabolic energy of one gram of fat (~~ 38000 J )"??

...certainly felt like more....