Anorexia

Anorexia nervosa, often referred to simply as anorexia, is an eating disorder, characterized by low weight, food restriction, fear of gaining weight and an overpowering desire to be thin. Many people with anorexia see themselves as overweight although they are, in fact, underweight. They also often deny that they have a problem with low weight.

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Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answered 3 months ago

There is no religious or ethical responsibility for things we cannot control. So, if you cannot control your actions, there is no sin.

However, if you refuse to eat and it harms you or leads to death, and if you can control this and have a free choice, then it is a sin, because it is a sin to harm yourself.

Whether or not you can control this is something you can decide; there is no benefit in being guilty over something which you cannot control, because it will probably just make things worse and add anxiety.

Inshallah I hope you will find a solution that will help you to be free from this problem. 

Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 3 months ago

It is a sin to waste food but it is not s sin to give it to others to utilize it when you don't want to eat it for any reason.
Your mental condition needs proper treatment to be a normal person with out anorexia or any other abnormality.

Wassalam.