I'm guessing this guy is 400lbs overweight. That's 1,400,000 calories stored in fat. I don't know how many calories a lardbeast would burn if they ran a mile, but at a healthy weight he'd burn 120 cal/mile so let's just go with 480 hamcal/mi as his starting point.  Evaluate the integral, and this dude has enough excess energy stored to run 280 marathons before reaching a healthy weight.