Alina thinks that she is overweight even if she is not. She often indulges in binge eating and later vomits the food out forcefully. Alina most likely suffering from Bulimia eating disorder.
If BMI (Body mass index) of a person lie between 25 to 30 then that person belongs to overweight category.
BMI depends upon height and weight of that person.
To learn more about overweight here.
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