Eating Disorders (Anorexia and Bulimia)
So a person with anorexia is basically unable to eat and they intentionally restrict their own food intake. So they might go on these long stretches of starvation, and it's like this constant state of being anxious where you might think you're gaining weight, even though you're not. In fact, you have very low body weight most of the times. And since there time are so many restrictions in the diet of the person, leads to a lot of nutritional deficiencies and can actually result in life threatening complications