Gastric Bypass

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): 1105–1121. 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.