How can I get anemia yet I am eating healthily and I don't experience any bleeding?

I am not pregnant and I am totally healthy before this. I just have very mild hypertansion but is being well control. I have no family history of anemia and no genetic illnes too.
Update: I have my well balance diet every meal. I have milk, cereal and fresh fruits for my breakfast, fish, chicken, greens and fruits for my lunch and dinner. Other than animal's liver, I can get iron from the greens... I still don't understant how can I get anemia.
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