How can she do that?

Every once in a while I marvel at how much my mother can eat and barely maintain her thin weight.

Case in point: I made a 9x13 of enchiladas for dinner.

Dh and I had what I'll call basic portions. He had a bit more than me, but between the two of us, we probably shared about 1/4 of the dish.

Perry and my mother polished off the rest, and she ate as much as Perry did. This is a young man who is all muscle and who rows every freaking day.

How?

Granted, she only eats two meals a day... but I do too. And my breakfast is a yogurt (140 calories), hers is two slices of banana bread with chocolate chips, LOL.

I just don't get it. Why could I not inherit THAT metabolism?