Eating disorders have increased in young children and higher than mentally in mind, a new study was discovered.
But it affects the same as boys and girls and there is only a clear gender difference when women are more likely to have bulimia, eating binge and other eating disorders after the adolescent.
Anorexia affected as much boys and girls
The prevalence of eating disorders in children aged nine and ten years was found to be higher than the previous estimates of 1.4 per cent as they suffered from other psychiatric illness.
Only when teens are children, gender differences are apparent, with almost all disorders more common in teenage girls than boys.
The study comes from research that shows that more than one psychiatric disorder is now more prevalent in children than teenagers.
It is estimated that more than 1.6 million people in the UK suffer from eating disorders such as anorexia, bulimia and eating.
But the real number is likely to be higher because there are "huge levels of unmet needs in the community", according to charities.
Anorexia is most common affecting women and women, although it has become more common in boys and men in recent years.
On average, the condition first develops aged 16 to 17.
Recent studies suggest that as many as eight per cent of women receive bulimia at some point in their lives and an estimated quarter of British people experiencing eating disorders may be male.
In order to reach the new findings, researchers investigated the frequency of eating disorders in more than 4,500 Americans nine to ten years of age participating in the Adolescent Cognitive Development (ABCD) study in 2016 and 2017.
It was decided to diagnose eating disorders using a parent or guardian.
Lead Author, Associate Professor of Psychology, Aaron Blashill, at San Diego State University: "Eating disorders are associated with morbidity and significant deaths.
"The number of early eating disorders has increased over the past decades, with younger children more likely than young people to experience psychiatric comorbidity."
Comorbidity is the presence of more psychiatric disorders.
A previous single representative study found that the percentage of eating disorders among children between eight and 15 years old found a 0.1 per cent for children between the ages of eight and 11, with 0.3 per cent for girls and 0.1 per cent It's not for boys between eight and 15 years old.
But he said: "This previous study used the Diagnostic and Statistical criteria of the Mental Disorders Manual and did not report the number of cases of diagnosis of specific eating disorders.
"The current aims of the study were to report anorexia nerfosa, bulimia nervosa, pond disorders, and other specific eating and eating disorders."
The new study found that eating disorders are higher than expected.
Professor Blashill said: "Across all diagnoses of eating disorders, the overall frequency was 1.4 per cent with no significant differences between girls and boys in a group that represent a national of 4,500 children between nine and 10 years old.
"The authors suggest that sex disorders in eating disorders do not appear until later in adolescents."
The researchers found that 0.1 percent of children in that age group were only anorexia, 0.6 were suffering from eating, while no bulimia was at all.
Professor Blashill said: "In this group of children, the number of anorexia nervosa was 0.1 percent, there were no cases of bulimia nervosa, the frequency of eating disorder equal to 0.6 per cent, and the prevalence of any feeding and other specific feeding, the diagnosis of eating disorder was 0.7 per cent.
"No significant sex differences were found across the diagnosis of eating disorders.
"Similarly, research past 13 to 18 year olds did not detect sex differences in the number of anorexia nervosa.
"However, there were apparent differences for bulky nerve, disciplinary eating pals, and anorexia nervous subsidiary, with higher prevalence among women.
"With each other, sex differences in eating disorders may not even appear to teens.
"This is consistent with previous research showing the lack of prepubertal sex disorders in eating disorders, with a high prevalence of eating disorders in women during and after adolescents."
The study is published in JAMA Pediatrics.
Without Grainne Cuffe
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