Summary
Instead of becoming lower during the day, the serum iron level rises when a person is fasting, and this all the more when this person is active. These facts suggest that some iron may be attached to the reserves (glycogen, fat), since the serum iron diminishes during the formation of these reserves (nourishment) and increases during their utilization (fasting, activity, night), unless the effect of fasting increased by activity be one of stress.
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Jacot, B. Influence du jeûne sur les oscillations nycthémérales du fer sérique. Experientia 7, 33–34 (1951). https://doi.org/10.1007/BF02165481
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DOI: https://doi.org/10.1007/BF02165481