Answer: Vanessa has Anorexia nervosa.
Explanation: Anorexia Nervosa is an eating disorder that occurs in people that believe they are too fat. They eat irrational to avoid gaining weight. It is the most common eating disorder.
Other eating disorders are;
1.) Bulimia nervosa: eating unusually large amount of food.
2.) Binge eating disorder
3.) Pica
4.) Avoidant/restrictive food intake disorder
5.) Rumination disorder