Every Morsel a Feast

This poetically-named Perk allows someone to live on a greatly-reduced diet, and to be able to thrive on things that most would barely consider food at all. A handful of moss scraped off a rock will provide sustenance for an entire day, for example. In older texts it is called 'Scavenger', and it appears that a century or so ago there was a deliberate attempt to rebrand it so it had fewer negative connotations. Note that although someone can live eating this way, this Perk does nothing for the taste.