“…Although studies reporting on iron‐deficiency anemia (IDA), which is the most common single nutritional deficiency, are limited, an association of IDA with depression severity and its relation to somatic (particularly gastrointestinal) symptoms was reported in 125 patients with IDA, compared with 57 healthy controls . Furthermore, IDA had a worsening influence on sleep quality, anxiety, and depression scores in 104 patients with IDA, compared with 80 healthy controls .…”