How to stop model names from being included in custom validation messages

[quasipickle]

I have some custom validation set up in my model. The message I want reported is "Calories" are too long. Only 5 digits allowed. However, the message that gets pulled from getMessages()[0]->getMessage() is <strong>Model\Item</strong>: "Calories" are too long. Only 5 digits allowed.

This is quite bad because

1. The users seeing this message don't have a clue what Model\Item means, and
2. This injects HTML into a message I would be displaying in a javascript alert() box.

How do I make validation report messages just like how I've defined them?