Is curls decline related to lesser amount of iron?Or is it related to warmness?

im confused with two reasons..im having negative amount of iron...as well as im living in a place with 45 amount Celsius...what is the real cause?
ref="http://www.mayoclinic.com/health/iron-deficiency-anemia/DS00323/DSECTION=symptoms" rel="nofollow">http://www.mayoclinic.com/health/iron-de…
http://www.keratin.com/ab/ab014.shtml
its because of ZINC deficiency

here are some hackle fall answer

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