Table 2.

Main micronutrient deficiencies after bariatric surgery.

Surgical Technique	Physiopathological Factors	Most Affected Micronutrients
Gastric banding	Decrease intake Food intolerance (meat, milk)	All micronutrients, especially those with low body stores (thiamine) Iron, zinc, calcium, vit D
Sleeve gastrectomy	Decrease intake Food intolerance (meat, milk) Gastrectomy	All micronutrients, especially those with low body stores (thiamine) Iron, zinc, calcium, vit D Vitamin B12, iron, calcium
Roux-Y gastric bypass	Decrease intake Food intolerance (meat, milk) Gastrectomy Duodenal/jejunal exclusion	All micronutrients, especially those with low body stores (thiamine) Iron, zinc, calcium, vit D Vitamin B12, iron, calcium Iron, calcium, zinc, copper, liposoluble vitamins
Biliopancreatic diversion duodenal switch SADI-S	Decrease intake Food intolerance (meat, milk) Gastrectomy Duodenal/jejunal exclusion Steatorrhea	All micronutrients, especially those with low body stores (thiamine) Iron, zinc, calcium, vit D Vitamin B12, iron, calcium Iron, calcium, zinc, copper, liposoluble vitamins Calcium, liposoluble vitamins