My girlfriend eats like a fucking rabbit?

Me and my girlfriend go to uni together and she barely eat. She doesn't eat breakfast at home, at uni she only drinks tea and nibbles on some carrots. Around lunch time, she gets a coffee to go and that's it...
when we eat dinner after uni, she only has 1/4 of a normal meal..
she is always tired, pissed off and annoying. What to do?
My girlfriend eats like a fucking rabbit?
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