Celery

[quigonginger]

No: HPFGUIDX 92795

This is one of those stupid, nagging things that probably has no 
relevance to the plot, but bugs me anyway.

In GoF, the Smeltings nurse gives Petunia a diet for Dudley which 
includes cottage cheese with grated celery (p. 40 US).  Isn't the 
point of eating celery on a diet a combination of the fact that 
celery is largely water (which would be lost in the grating process) 
and the fact that it is all stringy (also lost in grating) and has to 
be chewed much more than is worth one's time, thus burning calories?

Any dieticians out there?  This has been grating on my for years!

Ginger, vetran dieter, who has never eaten grated celery on even the 
oddest diets.