"Can anorexia cause such significant changes in a person that they stop being recognizable?"

Anorexia can lead to significant bone loss, increasing the risk of fractures and osteoporosis.

Anorexia can cause brain damage, including memory loss, difficulty learning, and decreased attention span.

Anorexia can result in decreased heart function, leading to irregular heart rhythms and even heart failure.

Anorexia can cause hormonal imbalances, leading to amenorrhea (absence of menstruation) in women and decreased sex drive in both men and women.

Anorexia can lead to anemia, a condition characterized by a decrease in red blood cells, causing fatigue and weakness.

Anorexia can result in dry skin, hair loss, and brittle nails due to nutrient deficiencies.

Anorexia can cause cold intolerance, as reduced body fat leads to difficulty maintaining body temperature.

Anorexia can lead to decreased muscle mass, affecting strength and mobility.

Anorexia can result in dental problems, including tooth decay and erosion, due to increased acidity in the mouth from vomiting or malnutrition.

Anorexia can cause esophageal tears, known as Mallory-Weiss syndrome, due to frequent vomiting.

Anorexia can lead to decreased immune function, making individuals more susceptible to infections.

Anorexia can result in anxiety, depression, and other mental health disorders, worsening the overall prognosis.