Are you referring to a Foley- urinary catheter?
Food, or crumbs would have absolutely nothing to do with sediment in a Foley.
The sediment is protein deposits in his urine that become solid in the tubing or bag
His diet would not impact this- urine when it is initially filtered in kidneys is obviously liquid, and eating crumbs etc would not impact this.
Many people with chronic Foleys do have sediment. Most of the time it needs changes of the catheter more frequently. On rare occasion we advise flushing the catheter - but this is not idea either as manipulating and flushing can lead to UTIs.
But you were right it is nothing to do with what he ate.
Good luck and please rate the reply