Tough Stuff in Food That Aids Digestion Process
Puzzle 3 of Day of the Dead Hard Pack
Question is: Tough Stuff in Food That Aids Digestion Process
and the answer is: ROUGHAGE
Word Meaning:
ROUGHAGE — Originally (archaic), garbage, rubbish, or waste; later (agriculture) the portions of a crop which are discarded, such as husks, stalks, etc.; also, agricultural waste such as weeds.
Definitions from Wiktionary.