Food intolerance refers to the difficulty (intolerance) in digesting and/or assimilating a component of food (eg gluten protein). As a result, we may experience a variety of symptoms such as bloating, inflammation, pain, nutrient malabsorption, weight loss, fatigue, etc., for reasons that have not yet been fully elucidated.
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Iron deficiency anemia is a common symptom in people with celiac disease (gluten intolerance). Let's take a look at whether IDA can be caused by consuming gluten-containing products.
Ας εξετάσουμε ερευνητικά λοιπόν κατα πόσο η εμφάνιση αναιμίας μπορεί να οφείλεται στη κατανάλωση προιόντων που περιέχουν γλουτένη.

A study that tested 190 adults with iron deficiency anemia for gluten intolerance (by taking an intestinal biopsy and blood tests) found that 26 of these individuals (13.7%) were diagnosed with gluten intolerance. Following a gluten-free diet for 24 months, all but one person managed to restore their iron levels in their blood.
Έπειτα απο ακολουθία δίαιτας ελεύθερης σε γλουτένη για 24 μήνες, όλοι εκτός απο ένα άτομο κατάφεραν να επαναφέρουν τα επίπεδα Σιδήρου στο αίμα τους .

Another study of 206 people with iron deficiency anemia found that 30 of the 206 people (14.6%) had gluten intolerance (tested with intestinal biopsy and tTG antibodies).
Comparing the two studies, we can observe the significant rates of gluten intolerance in people with IDA, reaching 13.7% in the first study and 14.6% in the second.

A test for celiac disease should be performed in adults with iron deficiency anemia. Moreover, the recovery of iron levels in these individuals may likely occur between 6 and 12 months following a gluten-free diet.
Ταυτόχρονα, η ανάκτηση των επιπέδων Σιδήρου στα άτομα αυτά, μπορεί να εμφανίζεται μεταξύ 6 και 12 μηνών έπειτα απο δίαιτα χωρίς γλουτένη.

Sources:
https://www.ncbi.nlm.nih.gov/pubmed/11197242
2η ερευνα:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2778123/