Anorexia.
You have fears that your daughter is developing anorexia. Over the past month, she has lost a lot of weight and you can hardly see how she eats. The weight is still within the normal range, close to the lower limit, but the dynamics are already frightening. Maybe you don't know how to deal with her.
Fasting for a teenager is not at all the same as fasting for an overweight adult. A teenager is growing rapidly, her/his hormonal system is changing, her/his brain and nervous system are developing, and if /she/he does not have enough nutrients, she/he may develop developmental defects. Therefore, as soon as you notice that a teenager deliberately avoids eating at home, you need to understand if she/he eats out and whether /she/he is starving, and if she/he is starving, urgently take action. In some cases medication will need to be started.
It is better not to talk about death from exhaustion, teenagers do not believe that this threatens them, they believe that they have a lot of time ahead of them. It is better to talk about: 1) hair loss and thinning, 2) early aging of the skin, cracks in the lips, 3) hormonal disruptions, cessation of breast growth in girls and body hair growth, 4) increased fear, anxiety, hysteria, 5) fungal and parasitic diseases due to a drop in immunity, 6) tooth decay, bleeding gums, rotten breath, 7) curvature of the bones of the skeleton, curvature of the legs, stunting, especially in boys, 7) development of myopia, memory impairment, decreased intelligence . And if a teenager builds a wall against your arguments, then these arguments should not be brought by you, but by a doctor or trainer. Could be a beautician or hairdresser, any potentially authority figure. When teenagers close themselves off from their parents, at first they are still open to the influence of other adults. Ideally, if a teenager has an idol relative, for example, an older cousin. Think about authority figures before, and not when trouble has already happened, invite them to your house, make friends.
We will teach you how parents should not only be friends with a teenager, but also communicate with his friends. Girlfriends of the daughter should at least sometimes come to you, you should be well acquainted with the closest of them. It would be nice to occasionally sponsor some events where you could see the company of a teenager, at least the narrowest circle, especially the person with whom he has a romantic relationship. Well, if you communicate with the class teacher, for this you need to give gifts for the holidays, come to parent meetings, initiate some kind of help to the class and school. The better you are integrated into the life of a teenager, the more leverage you have, and your integration depends on how useful you are to his close circle.You are not alone.