Orthorexia is an eating disorder that is characterized as an unhealthy obsession with healthy eating.

It often involves restricting certain food groups and over emphasizes "clean eating" to a point where it interferes with quality of life.

It is difficult to estimate how many people have orthorexia as there is currently no formal diagnostic criteria.

Here is what you need to know about orthorexia from common symptoms to how it's treated.

People develop orthorexia when they obsessively fixate on "healthy eating." While deciding to pursue a healthy lifestyle isn't bad, people with orthorexia become compulsive and inflexible with their eating.

Unlike other eating disorders, orthorexia is usually not motivated by weight concerns or body image issues, says Meghan Windham, a registered dietitian at Texas A&M University.

Orthorexia often starts because a person wants to improve their overall health by taking control of the foods they eat. For many, this means turning to fad diets that restrict certain food groups or promote specific eating patterns. Windham says following these types of diets can quickly become obsessive, even if they don't start out that way.

People with orthorexia tend to be concerned about the quality of the foods they eat, rather than the amount of food that they eat. Food concerns can vary among individuals with orthorexia. For example, some may restrict major food groups such as dairy or gluten while others may be fixated with only consuming raw foods.

Orthorexia is not considered an official mental health condition by the DSM-5 the manual used to diagnose mental illnesses. One reason for this is because symptoms of orthorexia tend to overlap with other conditions such as obsessive-compulsive disorder, anorexia, and other avoidant/restrictive food intake disorders (ARFIDs).

If left untreated, orthorexia can progress and lead to lasting mental and physical health consequences and may even take the form of other eating disorders like anorexia nervosa or bulimia, says Paula Quatromoni, DSC, RD, an associate professor and chair of the Department of Health Sciences at Boston University.

Like most eating disorders, the signs and symptoms of orthorexia are mental, behavioral, and physical. Orthorexia presents differently in individuals, so symptoms may vary from person to person.

Mental, or emotional symptoms, of orthorexia tend to be similar to those of other eating disorders and obsessive-compulsive disorder (OCD). These include:

Behavioral symptoms are some of the earliest signs of an eating disorder. According to Windham, those associated with orthorexia include:

People with orthorexia are at a higher risk of developing micronutrient deficiencies because they tend to restrict certain food groups. This can lead to physical symptoms if the deficiency is left untreated.

Here are some common micronutrient deficiencies in people with orthorexia and their corresponding physical symptoms:

These obsessive and compulsive behaviors around food choices can impede on a person's social life. "Some people find it easier to compulsively stay at home, rather than socialize to have complete control over theirfood environment, which quickly becomes a really isolating way to live," says Quatromoni.

It is important to try to recognize when someone needs help with orthorexia sooner, rather than later. "The longer someone has been in the trenches with this, the greater the health risks, and the longer the road to recovery will be," says Quatromoni.

It can be tricky to tell if someone has orthorexia or if they are just a healthy-eater. Windham says healthy eating has progressed to orthorexia when, "your food intake is governed by strict rules, rather than day to day choices."

According to Quatromoni, here are some signs that may indicate a person is developing orthorexia:

Early identification and intervention can help people with this disorder have the best possible outcomes in recovery.

If you are worried that someone you know may be experiencing these symptoms, here is some advice on how to approach them about your concerns, says Lauren Smolar, the director of programs at the National Eating Disorders Association.

"Oftentimes the symptoms we see in people with orthorexia are extensions of underlying psychiatric conditions or they are triggered by psychological stressors," says Quatromoni.

There are certain factors that place some people at higher risk of developing orthorexia. These include:

Orthorexia is treated with a combination of nutrition counseling and therapy. "It's important to work with a dietician to correct nutrient deficiencies and restore physical well being, as well as a mental health professional to treat the psychological side of this disorder," says Quatromoni.

"Nutrition counseling can help people with orthorexia relearn what a healthy plate looks like," says Windham. Nutrition counseling is education-based and can help people with orthorexia re-incorporate food groups they are scared of and understand the benefits of a varied diet.

Meanwhile, therapy can help people with orthorexia understand underlying mental health issues and stressors that may be driving their rigid food behaviors. If people are also suffering from anxiety or OCD, they may be prescribed medication to treat those conditions.

Read more about finding the best treatment options for eating disorders.

If you are concerned your healthy eating habits have become disordered or started to impede on your quality of life, you should seek help from a dietician, therapist, or contact the National Eating Disorders Helpline. "Even if you don't meet any official diagnostic criteria you are still deserving of care to help you work through the concerns you have about your behaviors," says Smolar.

Read more:
How to recognize the symptoms of orthorexia and get the help you need - Insider - INSIDER