Look beyond body shape to identify a difficulty with food. Photograph: Keith Morris/Alamy

I discovered during sixth form that three of my friends had had an eating disorder of their GCSE years. Whenever, my immediate reaction – for which I now chide myself – was one in all surprise: they’d always looked so healthy.

As someone who has since come through an eating disorder myself, and as a volunteer for Beat – the UK’s leading eating disorder charity – I’ve spent years encouraging people to see beyond the visual to recognise the disease.

Only 10% of eating disorders sufferers are anorexic – and easily identified by severe weight reduction. Around 40% be afflicted by bulimia (binge eating and purging) and the rest 50% from “ednos” (eating disorder not otherwise specified, a class into which binge eating falls).

Though some people fighting bulimia or ednos are underweight, the bulk have an average BMI, while some are overweight. After I heard my friends’ admissions, I instantly fell into the trap of equating “eating disorder” with “emaciation”, forming a bunch of regrettable assumptions about their experiences.

It’s often assumed that anorexia is fuelled by vanity and a like to emulate skinny celebrities. Actually, eating disorders, including anorexia, are serious mental illnesses, triggered by a posh interplay of low self-worth, difficulties in dealing with problems and – possibly – genetics.

To recognise and understand these conditions, we have to seek for behavioural signs in addition to weight changes. For instance, a chum with an eating disorder may become more withdrawn, preferring to spend time alone in place of engage in social situations they used to enjoy.

They may become extremely anxious at meal times and take a look at to get out of events that revolve around food – you could notice they’ve taken to eating alone.

An obsession with calories and fat content can also be a hallmark, as can strict avoidance of certain food groups.

Some those with eating disorders – particularly anorexia – prefer to engage in lengthy discussions about food, sometimes as a method of indulging through conversation, and often to determine more about others’ eating habits against which they could measure their very own.

Look out for physical and emotional symptoms: side-effects can include fatigue, difficulty concentrating, insomnia, frequent illness and mood swings.

If you believe a chum has an eating disorder and also you desire to help, you will have to elevate the topic gently. Reading through these dos and don’ts before broaching the subject can help, but don’t beat yourself up if the conversation doesn’t go in addition to you’d hoped: your friend will appreciate your concern.

Offering to compliment your friend to a GP appointment could be a helpful first step, as GPs refer people directly to services which could help them.

Peer-to-peer support generally is a really valuable way of complementing professional services. Student Run Self Help (SRSH) is a network of groups run by trained students in lots of universities around the UK. It aims to supply a secure, confidential space for college kids with eating disorders to share their experiences; attendance doesn’t require a diagnosis. Going to teams for the 1st time could be daunting, so offering to accompany your friend might give them the arrogance to show up.

“When students face mental illnesses, they’re most probably to show to their friends for support,” says SRSH founding director Nicola Byrom. “The issues faced by teens with eating disorders are usually wrapped around problems with low self-esteem, so knowing that you’ve got friends there to support you can also make the realm of difference.”

Recovery is usually a slow process – you will need patience in addition to understanding to assist rescue your friend from the turmoil they’re going through.