well, 4.2 pounds...see local chinese buffet to-go option is like they weigh ur food and u pay, so i got like 4.2 pounds for like $20 and i ate it all in 20 min
MY SOTOMACH IS SO FULL I THINK IM ABOOT TO POOP.
ok, now what you have to do is, before taking a shit, stand on a scale, and see if 4.2 pounds of food comes out.
More than likely, less will come out, so you have to use E=MC^2 and using the mass of the food times the speed of light squared you can find out how much energy you recieved from the food.