Andy Dingley wrote:

No. They're both full of formaldehyde and pretty toxic to eat.

However they're both also very damp sensitive. If you have a crummy
environment, watch for them getting wet (usually from the bottom
edges). If they are damp, try to dry them out completely whilst laid
horizontal, before they start to bend.

In extreme cases of damp chipboard, you may get slugs - but I've never
seen a worm or boring beetle.

I have. It was in an inherited piece of furniture - lovely wood veneer,
but over chipboard. One day I heard a scrabbling sort of sound and
discovered dozens and dozens of small brown beetley-looking creatures
exiting the furniture across the dining room floor. They were coming out
of the chipboard core, and there were piles of 'sawdust' in the interior
bits of the unit. This was years ago, and the cabinet was made sometime in
the 1960s, so presumably different glues, etc, were used.

Sheila