this article states that, "The biological factor can be a cause for anorexia nervosa. Premature birth, diabetes mellitus, maternal anaemia, heart abnormalities can become a factor for the development of anorexia nervosa. People with the gastrointestinal disorder can be the biggest risk factor for anorexia nervosa. It is also more likely to occur in a person’s pubertal years".

is this statement a researched fact?

https://buddingpsychologists.org/anorexia-nervosa-and-rumination-disorder/