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Gastric bypass, also known as Roux-en-Y gastric bypass (RYGB) is the most common form of bariatric surgery performed where the stomach is divided into a small upper pouch and a much larger lower "remnant" pouch and then the small intestine is rearranged to connect to both.
Nutrient deficiencies may arise due to:
Reduced dietary intake
Decreased capacity for digestion due to changes in stomach size
Micronutrient absorption impaired due to bypassing sections where absorption predominantly occurs
Source: Xanthakos, Stavra A. Nutritional Deficiencies in Obesity and After Bariatric Surgery. Pediatric clinics of North America 56.5 (2009): 11051121. PMC. Web. 25 Feb. 2017.
Post Operative Bariatric Nutrition: Gastric Bypass
Nutritional Deficiencies
Pre and Post Bariatric Surgery/Procedure
Pre-Surgery
Post-Surgery
Protein
X
X
Calcium
X
Vitamin A
X
X
Vitamin B1 (thiamin)
X
X
Vitamin B6 (pryidoxine)
X
X
Vitamin B12 (cobalamin)
X
X
Folate
X
X
Vitamin C
X
X
Vitamin E
X
Vitamin K
Vitamin D
X
X
Iron
X
Magnesium
Potassium
Zinc
X
X
Selenium
X
Copper
X
Nutritional deficiencies table shows deficiencies more commonly reported in research studies. For more information about deficiencies by procedure, and how these were identified, visit the resources section of Bariatric Advantage.