PTH and vitamin D deficiency: This finding is consistent with previous findings that were unable to detect a relationship between IGF‐1 (insulin‐like growth factor 1) measures and lean mass.24 Recently, vitamin D deficiency was shown to be associated with leg lean mass, suggesting a possible mechanistic link.24 We found no relationship between vitamin D and lean mass even though our population tended to have elevated parathyroid hormone, likely reflecting subclinical vitamin D deficiency.