my earlier post about Leela's strength made me think too about how much homegirl would have to eat to live like that, which is, of course, not totally a science.
I'm assuming she's about 5'10" and 160lbs, which means that just to exist in the world, sitting on the Planet Express lounge couch, she'd need about 1,700 calories a day.
I'd consider her "Extremely Active" between a labor-intensive job, strength training, cardio, and martial arts - which would add an additional ~1,000 calories a day to MAINTAIN her current level of muscle mass.
So Just to maintain her current body comp, she'd need about 2,700 calories a day. Just. To. Maintain.
If she's trying to put on muscle, then she'd need about another 300-400 calories a day on top of that.