[Jonty30]

Personally, I’m thinking of the lack of nutritional value. How nutritious can a worm be whose sole source of nutrition for it is wood pulp?

[TigersEye]

How nutritious can an animal be whose sole source of nutrition is dried grass?

[x]

I won't be eating them either. But I wonder: cows eat grass which we can't digest. Possibly the worms turn the wood into something with nutritive value. Plants do that with dirt

Anyway, I grew up hearing that our 21st century descendants would be eating processed algae, so bug and worm eating seems like part of the general plan.

[gundog]

How nutritious can a worm be whose sole source of nutrition for it is wood pulp?

Wood is primarily the substrate that they live in, and are protected by.

Per Wikipedia:

Like most marine based bivalves, teredo worms are primarily filter feeders and consume mostly seston, and not wood.[2] Wood supplements their primary diet and is consumed with the assistance of bacteria inside their [gill] cells.[3] However, wood is not a necessary part of their diet and they can live on the surface both of wooden and non-wooden structures.[4]