Anorexics have such a distorted body image that they squeeze through doorways even when they don't have to, researchers found.
Young women with the eating disorder turned side-on to get through a gap when it was 40 per cent wider than their shoulders.
But healthy women only began to do so when the space was much narrower.
Researchers at the University of Utrecht in the Netherlands said their finding suggests the disease's effects on the mind run deeper than previously thought.
They asked 39 young women to walk through a gap between two panels, which was made wider and narrower.