Eating disorders are diseases that arise in the mind and are expressed through the body. This implies that suffering is lightened through food and weight. Getting sick is not a choice, so it can not possibly talk about guilt.
Guilt is an imaginary problem, difficult to stop. It can produce a difficult condition that results in loss of the ability to decide and to act, preventing the achieving of what someone want. The process leading to face the guilt is the own acceptance, giving us the opportunity to forgive ourself and understand the real reason causing such suffering.