Final answer:
Josie appears to have Bulimia Nervosa, an eating disorder involving cycles of binging and purging due to fear of weight gain.
Step-by-step explanation:
Josie is exhibiting symptoms that align closely with Bulimia Nervosa. This eating disorder is characterized by a cycle of binge eating followed by compensatory behaviors, such as self-induced vomiting, to avoid weight gain. The behavior often stems from an extreme fear of gaining weight and a deep dissatisfaction with one's body size or shape.
Bulimia nervosa can have significant physical and emotional health consequences, including electrolyte imbalances and mental distress.