What material do silverfish primarily feed on?

Silverfish primarily feed on starchy materials, making dried glue the most relevant option. These insects are opportunistic feeders and are known to consume various items that include carbohydrates, sugars, and cellulose. This feeding behavior allows them to thrive in environments where such materials are abundant.

Dried glue contains starches and other organic compounds that can serve as a food source for silverfish. Their diet can also include other things like paper and bindings made of starch, which emphasizes their preference for materials with a high starch content.

While the other materials listed can be associated with silverfish in specific contexts, none match their strong preference for starch-filled substances as closely as dried glue does.