"Perfect is the enemy of good enough." I've seen lots of proof of that since I started following FPH, nutrition and the obesity crisis. I see plenty of people bloo-blooing about the inaccuracy of numbers for caloric intake or output, for instance METs from the Compendium of Physical Activities. Who cares about a small two-digit difference, you derp? When you're cutting, overestimate your intake, then reverse as needed. Of course, if you're looking for excuses, this makes for a mighty fine one if your audience is ignorant... hmm...