Hello doctor. I'm 21 male and I ate slate pencils (chalks) for 1 year, 6 years ago and I'm becoming anemic repeatedly. I went under several tests but everything seems to be normal but in tests of iron serum and iron ferritin results were 22ug and 6.5ug respectively. Doctor gave me supplements of iron zinc and b12. After the course I was normal with 12gm hemoglobin and again few months later I'm went anemic again. Is there any permanent cure doctor. From the past 5 years I have stopped eating slate pencils but I still suffer. Can this problem be cured permanently.