Even tiny amounts can accumulate with other tiny amounts for a larger
grand total.
(After a while the style settles down a bit and it begins to tell you
things you really need to know, like the fact that the fabulously
beautiful planet Bethselamin is now so worried about the cumulative
erosion by ten billion visiting tourists a year that any net imbalance
between the amount you eat and the amount you excrete whilst on the planet
is surgically removed from your bodyweight when you leave: so every time
you go to the lavatory it is vitally important to get a receipt.)
-HHGTTG