From Terraria Wiki
|Tooltip||Summons the Eater of Worlds|
If Worm Food is used when the Eater of Worlds is already in the world, it will deal ~10,000 damage to the user.
- Although the Crimson is equivalent to the Corruption, using Worm Food in the Crimson will not do anything.
- It is however still possible to summon the Eater of Worlds in a world that spawned Crimson by artificially creating a Corruption biome (with Corruption-related blocks from another world), and then use the Worm Food within that.