Why does my girlfriend loose weight so easily when she doesn’t eat?

My gf gains weight fast if she eats a lot. Her face and stomach begins to bloat and look a little chubby but when she wants to slim her face and stomach she just eats little and starves herself.. but even two days of just eating light food makes a drastic difference.. her stomach will go from having a tummy to... show more My gf gains weight fast if she eats a lot. Her face and stomach begins to bloat and look a little chubby but when she wants to slim her face and stomach she just eats little and starves herself.. but even two days of just eating light food makes a drastic difference.. her stomach will go from having a tummy to having a flat stomach.. it’s so strange
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