No, as far as we know she is a BCI. We got her from a rescue though, so we have no idea what age she is. I've guessed (based on looking at others) that she's possibly around 4-5 years old, but then again not knowing how she was raised makes it near impossible to tell just from looking at her. I've heard about the ratio of fat, but she's always eaten every two weeks like she was starving, and occasionally she's gone three weeks. I'll wait and see if she wants it next week.
I'll switch it up then. Next batch of rats I get, I'll downsize and just feed more often or supplement with a small in-between meal if needed.