“…Decreased intestinal absorption Conditions after intestinal resection [103,116] Diarrhea [103,107,108] Malabsorption [103,107,108,117] Chron's disease [103,108,117] Ulcerative colitis [103,117] Coeliac disease [103,107] Stressing Factors Pregnancy [32,34,102,118,119] Lactation [32,34,102,118,119] The growing period [102,120] Sport performance [102,[121][122][123] Old age [103,107,109,119,124,125] Convalescence [86,87,102] Endocrine disorders Hyperthyroidism [104,126,127] Aldosteronism [104,126,127] Hyperparathyroidism…”