<s>[INST] hi, ive been eating blackboard chalks for the past eight months now and i doubt if its going to cause any serious issues regarding my kidneys n stuff. Im already seeing that by eating chalk, my teeth are slowly grinding. Whatls wrong with me n how do i get rid of eating chalk. Im 30, skinny my bust is almost vanished, tubal ligated mother of 3 kids :( kindly help. thanks [/INST] Hi, Eating chalk for past 8 months is an odd eating behavior that needs both physical and psychological evaluation. Many causes like iron deficiency anemia, malnutrition, obsessive compulsive disorder etc. has to be ruled out that may be the cause of this behavior.  Toxicity of substances contained in chalk has to be ruled out. It is advisable to visit your doctor at the earliest. Hope this helps, Chat Doctor.  </s>