The first stage is "iron depletion" where iron stores are used up to correct the deficiency. The second stage is "reduced red blood cell formation" where iron supply is not enough to support RBC formation. The third and final stage is "iron deficiency anemia" where hemoglobin concentration is affected and drops below the normal range.
Beetroot juice, spinach and mint juice, prune juice are some of the drinks with good iron source. Other iron rich foods are jaggery with groundnuts, legumes, paneer, soya, quinoa, pumpkin seeds. You may include vitamin C such as lemons, oranges in diet to increase iron absorption.