Many people related the eating disorder with people that are super thin and will do anything to ensure that they stay that way. There however is so much more to the disorders and so many types, with some only affecting their behavior with food and some the obsessive thinness drive. These types are also categorized as feeding disorders and other eating disorders based on the causes and the treatment, and the feeding disorder starting earlier in life.
The Pica eating disorder, mainly characterized by the eating of the non-food substances or the non-nutritive ones is a good place to start. They usually have the capability to eat other foods, last for more than a month and the persons usually have other development or psychological disorder. The second one is the rumination eating disorder that is mainly characterized by the repeat regurgitation of partially digested food that is either spit out, re-swallowed or re-chewed and this goes on for more than a month and onset can be any life stage. Many patients will avoid eating in public to avoid this behavior, lose weight for the same and when the medical conditions like the pyloric stenosis and the GERD are ruled it then they may be having this disorder. The treatment options that are very common for this disorder are behavioral therapy.
When the person avoids foods or some of the foods then they may be having Avoidant Restrictive Food Intake Disorder (ARFID). This is due to the fear of the food itself and other things like the allergy and not the weight gain, and for this they may lose weight, have improper growth and nutritional deficiency. When they have definite caloric intake restriction on the other hand for the fear of weight gain then they are said to have the Anorexia Nervosa. The person have pretty intense fear of becoming fat of gaining weight, they have distorted sense when it comes to their weight and appearance, cooking and recipe obsession despite the fact that they may not eat and they may restrict intake only, or bingeing and purging for some three months’ period. Bulimia Nervosa is another eating disorder that is often characterized by the binge eating episodes or large food quantities consumptions at a go, and recurrent compensatory behaviors to prevent weight gain. They may hide this and with the fact that they may have normal weight, it may go untreated for a long time.
Binge Eating Disorder us mainly characterized by the compulsive overeating even when the person already feeling uncomfortable or is no longer hungry. The last one is the Eating Disorder NOS, where the individual has eating disorder symptoms causes significant functioning impairments and is viewed as a disorder by the peoples or other people. They involve Atypical Anorexia Nervosa where that behaviorally meet the criteria but are not underweight, Binge Eating Disorder or Bulimia Nervosa occurring for a shorter time or less frequent than required for the professional to make formal diagnosis, purging without the compensatory behaviors and Night Eating Syndrome which is the binge eating at night alone when they wake.
If you see such systems then you should, get medical attention and quick.