I will start from afar about the diagnosis of anorexia , how it is diagnosed and what features can be seen in the article of the Nizhny Novgorod Center for the Treatment of RPD The difference in approaches to the diagnosis of RPE. Therefore, the early medical criteria are low weight.
About the early psychological criteria below, I'll start with the reasons, You can read about them in the article Causes of anorexia.
For a more explicit representation of all stages of anorexia development, you can read in an article about a typical special case of an adolescent girl falling ill with anorexia with an analysis of the mechanism of the disease.
How early criteria are you interested in?
If you take adolescence - dissatisfaction with yourself, a background feeling of shame.
If you take childhood - dissatisfaction with yourself, a feeling of shame, lack of praise, frequent criticism with accusations and shame.
If we take infancy - high emotional sensitivity of the baby, too obedient child, parents do not like to praise, but they often blame and shame, care little about the child, control more.
If we take the childhood of a mother, the same shame , lack of praise, mom's not self-love in adolescence at the same age, lack of care and parental control.
Caring is when we first ask - then we do.
Control is when we first do, then offer.
Everyone manifests in different ways.
Basically it is a fear of food, self-loathing, admiration for an overly thin figure and avoiding noisy companies, so as not to be judged by others. There is fear of others, attempts to feed friends, parents, treat with their food.
Usually, everyone does not have it suddenly, so you can track some signs:
Little things about appearance: a person begins to stand at the mirror for a long time, looking at himself, wearing loose clothes, as if he is embarrassed by his body;
Not a very clear sign, characteristic of many things: a person withdraws into himself and becomes a recluse, or vice versa, starts doing a bunch of things right away.
Most often gradual restrictions on food: refusal of sugar or meat. This leads to further restrictions.
The most obvious sign: the reaction to the raising of food questions in conversation is changing. A person shuns this topic, gets scared or annoyed, translates the topic - when they talk about him. For the rest, a very intense hobby for cooking can begin: watching cookbooks, publics with food. Also, a person can start to cook a lot of dishes that he feeds to others, but does not eat himself - here you should immediately worry.