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Related Concept Videos

Enteral Nutrition I: Orogastric and Nasogastric Feeding01:26

Enteral Nutrition I: Orogastric and Nasogastric Feeding

Enteral nutrition delivers nutrients directly to the stomach or small intestine through a tube. This method is appropriate for patients who cannot eat but still have a functioning digestive system. It is also beneficial for individuals with swallowing difficulties, anorexia, malabsorption, or those who have undergone gastrointestinal (GI) surgery.
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Enteral Nutrition II: Nasointestinal and Gastrostomy Feeding01:15

Enteral Nutrition II: Nasointestinal and Gastrostomy Feeding

Enteral nutrition encompasses various methods of delivering nutrition directly to the gastrointestinal (GI) tract, bypassing traditional oral intake. It is particularly beneficial for patients who cannot eat by mouth but have a functioning digestive system. Key methods include nasointestinal feeding, gastrostomy, and jejunostomy, each suited to different clinical scenarios based on the patient's needs and condition.
Nasointestinal Feeding
Nasointestinal feeding involves placing a tube through...
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Peptic Ulcer Disease V: Surgical Management and Nursing Care

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Pyloric Obstruction01:11

Pyloric Obstruction

Pyloric obstruction, also referred to as gastric outlet obstruction, is a condition characterized by narrowing or blockage at the pylorus—the muscular valve regulating the flow of stomach contents into the duodenum. When this passage becomes impaired, the stomach cannot effectively empty its contents into the small intestine. This disruption leads to a range of gastrointestinal symptoms, including early satiety, bloating, epigastric pain, postprandial nausea, persistent vomiting, and...
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Related Experiment Video

Updated: May 11, 2026

One-anastomosis Gastric Bypass (OAGB) in Rats
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One-anastomosis Gastric Bypass (OAGB) in Rats

Published on: November 10, 2018

Nutrient deficiencies after gastric bypass surgery.

Edward Saltzman1, J Philip Karl

  • 1Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA. edward.saltzman@tufts.edu

Annual Review of Nutrition
|May 7, 2013
PubMed
Summary

Bariatric surgery, like gastric bypass, effectively treats obesity but can cause nutrient deficiencies. Supplementation is often necessary to prevent or treat common deficiencies such as thiamine, vitamin B12, vitamin D, iron, and copper.

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Last Updated: May 11, 2026

One-anastomosis Gastric Bypass (OAGB) in Rats
08:16

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Published on: November 10, 2018

Roux-en-Y Gastric Bypass Operation in Rats
07:37

Roux-en-Y Gastric Bypass Operation in Rats

Published on: June 11, 2012

Area of Science:

  • Bariatric Surgery
  • Nutritional Science
  • Endocrinology

Background:

  • Bariatric surgery, especially gastric bypass, is a successful long-term treatment for obesity and related comorbidities.
  • Nutrient deficiencies are common post-surgery due to multiple contributing factors.

Purpose of the Study:

  • To identify common nutrient deficiencies following bariatric surgery.
  • To explore the causes of these deficiencies.
  • To discuss prevention and treatment strategies.

Main Methods:

  • Review of literature on nutrient deficiencies after gastric bypass.
  • Analysis of preoperative and postoperative factors contributing to deficiencies.
  • Identification of commonly deficient micronutrients.

Main Results:

  • Common deficiencies include thiamine, vitamin B12, vitamin D, iron, and copper.
  • Factors include preoperative obesity, weight loss, reduced intake, poor diet quality, altered digestion/absorption, and nonadherence to supplements.
  • Other nutrient deficiencies are sporadically reported.

Conclusions:

  • Diet and standard multivitamins may not prevent deficiencies.
  • Specific nutrient supplementation is often required.
  • Most micronutrient deficiencies after gastric bypass can be prevented or treated with appropriate supplementation.