Your hair falls out, you turn a yellow colour, and your nails go horrible and brittle

Amenorrhea (interruption of the menstrual cycle): Amenorrhea is present if there is an absence of at least three consecutive menstrual cycles, or if the person needs to take estrogen for her normal cycle to occur.
Bone loss (osteoporosis or osteopenia)
Extra sensitivity to cold
Bloated stomach after eating (since the stomach loses its ability to deal with a normal quantity of food at one sitting)
Lanugo–a fine hair that grows on the skin in response to the body's need for warmth
Yellowed skin (often from getting too much vitamin A as a result of eating only certain foods, like carrots)
Thinning hair
Mental and Behavioral Symptoms of Anorexia Nervosa
In addition to physical changes, friends and family may notice changes to the person's thoughts and behaviors:

Distortion of body image or excessive importance placed on body composition or shape
Denial of seriousness of low weight
Intense fear of gaining weight or becoming fat, even if the person is considered underweight
Confused thinking (since the brain needs fuel to function properly)
Ritualistic eating (including cutting food into a planned number of bites)
Spitting out food before swallowing
Much more attention paid to nutrition labels
Major increase in exercise output, even when exhausted
Hatred for foods that used to be favorites
Refusal to eat with others
Binge eating (for the binge eating/purging subtype of anorexia)
Increased or unnecessary use of laxatives, or vomiting after eating

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