Final answer:
The reader can tell that Alice has an eating disorder based on her consistent low food intake, unrealistic body perception, and the possibility of purging behaviors.
Step-by-step explanation:
The reader can tell that Alice has an eating disorder based on a few clues mentioned in the provided information. Firstly, Alice consistently eats very little, which is a characteristic of anorexia nervosa. She also has an unrealistic perception of her own body size and sees herself as fat even when she is very thin, which is known as body dysmorphic disorder. Additionally, Alice may engage in behaviors such as using laxatives or forcing herself to vomit after overeating, indicating a possible case of bulimia.