Comment by 0_____0

Potatoes are ~0.7kg/L, so that's ~8.4L of potato over the course of the day & 370 grams per waking hour, which is one big potato.

Yes my examples were somewhat high energy density but in the second example, I probably had 3L+ in my belly in just one meal. Honestly I think your body just gets used to it.

I'm not familiar with the 13 lb of potato claim, but it strikes me as a stretch (hah!) but not inherently implausible.