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Anorexia is an eating disorder that causes weight loss above the level that is considered healthy for your age and height. People with anorexia can have a big fear of putting on weight, even when they are in normal weight. They can misuse diet and exercise and also use other methods to get thin.
The exact cause of anorexia is still unknown, but is believed that biological, psychological and environmental factors may be involved in the possible causes of this illness