cramping feelig after eating food

so i want to ask something.. my friend starved herself to 46.5kgs.. she is 5'6.. (yeah i know horrible, she still wants to lose more ) anyway.. she has this constant cramping feeling now after she eats something and she has to poop otherwise it wont get better.. like the pain doesnt gets better until she poops.. i was curious.. why is this happeneing to her?

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