The NHS needs to change the way nutrition disorder is evaluated as a result of a connection with autism, as a research charity said.
Autistica said the findings suggest that five women with anorexia in UK clinics may also have autism and tailor-made therapy.
A woman said her autism was "obsessed" with calories, although she did not lose weight.
The NICE health minister said he needed more research.
Sophie McInnes, at the age of 24, said that the BBC's Victoria Derbyshire program did not develop anorexia due to body impairment or weight problems, but developed some rules to eat a lot of calories.
He said he wanted to put his weight on it, but his autism was not diagnosed at the time, he said he would not leave it.
"Calories, everything that was all about numbers," said 19-year-old children.
"In reality, I started eating a lot of food and I did not eat anything.
"They put me in a wheelchair and said that my weight was so small that if I did not eat it, I had to be dry."
In the end, Sophie left the unit, but continued to fight for weight.
A few years later, in 2018, he diagnosed autism.
If he had seen links earlier, he said, which would be helpful for recovery.
"A large part of my life has come so far and I want to move on," he said.
More research is needed
The director of Science, Autistica, Dr. James Cusack, has said that the new National Institute of Health and Clinical Excellence (NICE) demands new guidelines.
Currently, the guidelines do not mention autism.
"We also need NHS services involved in the research," said Dr. Cusack. "Testing of studies and nutrition disorders."
His proposal protects former Norman Lamb minister.
Lib Dem MP called the Victoria Derbyshire program to find out that "practice" was "an essential" practice.
"We can apply the right care of women in good conditions," he added.
NICE said in a statement that some factors had been acknowledged, such as autism it was necessary to take into account in relation to eating disorders, but nowadays it has been "very little" demonstrated by the involvement of healthcare professionals, in which cases it should be changed.
NHS England has been approached by the comment.
Will Mandy, the leading autistic researcher of University College London, says that women and girls are far less likely to recognize men than autism.
It is believed to be "high levels of stress and anxiety" caused by an undiagnosed condition in childhood and adolescence, contributing to people living with severe mental health conditions, such as eating disorders.
Recognition of professional health between autism and anxiety was crucial, he said.
"You do not know if someone is autistic, it is very difficult for them to become supportive and autistic treatment," said Mandy.
In a correct manner, changes may be easy, for example, easier communication and respect for the environment.
The Eating Disorder Service at Caroline Norton, South London and Maudsley's NHS Trust said autistic patients were suddenly trying to get rid of other noise in the same space.
Health professionals can also try to have patients more comfortable.
An elderly patient in this service, Mr. Norton, said, would hardly communicate with the therapist face to face, but would provide a long response through email at least after the session.
"I fill them one by one at the level they need," he added.
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