“…For example, copper deficiency occurs in 10 to 20% of patients who have undergone Roux-en-Y gastric bypass, but there is only one case report of copper deficiency occurring after sleeve gastrectomy. 24 This patient had been taking vitamin D and vitamin B 12 supplements, and a thiamine supplement was added after alcohol use was discovered. However, he had not been taking a daily multivitamin and was at risk for other deficiencies, such as deficiencies in vitamin C and folate.…”