Pretty much what Josh said. Eating a lot when offered does not mean underfed. I know both my BCI girls will eat until my pockets are empty but my big girl is a bit chunky so she is on a diet. But anyways, does your burm have the spine sticking up or extremely skinny( the kind of skinny where it looks like a twig) or something else like that? Burms, boas and retics all are very willing and opportunistic eaters. Most wont pass up a meal.