MaizieD
^Anything else can cause fatbergs to form, as the 'other items' join and lump up together.^
Fatbergs form because stupid people put fats and oil down their sinks. And wetwipes, condoms, tampons and god knows what else down their toilets.
Faeces are digested food, often in a large and solid lump. OP is talking about small amounts of undigested food. In small pieces. I can see the first being more likely that the second to block a toilet. And not a great deal of difference in composition between the two...
as I have said, faeces are digested food and will break down into a suspension in water, uneaten undigested food will not