Anorexia or purging otherwise known as bulimia.
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You need to exercise to keep your body in shape and eat healthy to keep your heart and your bones healthy. Stress is always going to happen but what i do is exercise to keep things off my mind or listen to music. Moods will always change sad, happy, angry ect, but Keep your mind positive and your body healthy.
Good Luck ;)
Bone marrow, is one but I don't know any else off the top of my head