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The Truth About Symptoms of Malnutrition After Gastric Bypass

Nutritional Deficiency After Gastric Bypass

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Gastric bypass, like any other surgery, has its risks and complications. The altering of the gastrointestinal tract during gastric bypass surgery results in reduced absorption of calcium, iron, and some vitamins. This can cause malnutrition.

Protein Deficiency

The American Society for Metabolic and Bariatric Surgery (ASMBS) lists the following as the signs and symptoms of protein deficiency after gastric bypass surgery:

  • Hair loss
  • Tiredness
  • Swollen legs

Sign of Protein Deficiency After Gastric Bypass

Multivitamin and Mineral Deficiency After Gastric Bypass and Their Symptoms

Iron1 Weariness
Calcium Pain in the Bones
Zinc Easily Breaking Nails
Vitamin A Difficulty in vision in the dark
Vitamin E Poor healing of wounds
Vitamin K Bruising Easily
Vitamin B1 Numbness and tingling sensation in the limbs
Vitamin B12 Tiredness

Diet for Gastric Bypass Prevent Deficiency

How to Overcome Nutritional Deficiency After Gastric Bypass

  • Make protein a priority by incorporating fish, dairy, legumes, and beans in the gastric bypass diet.
  • Do not skimp on fresh vegetables and fruits.
  • Make sure to follow your post-bariatric multivitamin regimen.
  • The dosage for B-complex, calcium, and iron should be higher than the usually recommended levels.
  • Make sure to have a heavy dosage of Vitamin B12 if taking it in the form of pills.
  • Have a citrated form of calcium to achieve its optimal absorption.
  • Iron should be taken along with Vitamin C for optimal absorption.
  • Never combine iron supplements with calcium, as the two taken together will try to outdo each other to get absorbed by the body.


  1. Steenackers, N., Van der Schueren, B., Mertens, A., Lannoo, M., Grauwet, T., Augustijns, P., & Matthys, C. (2018). “Iron deficiency after bariatric surgery: What is the real problem?Proceedings of the Nutrition Society, 1-11. doi:10.1017/S0029665118000149
  • Vomiting/throwing up after gastric sleeve
  • Gastric bypass malabsorption syndrome
  • Nutritional deficiencies after gastric bypass
  • Gastric bypass starvation
  • Protein deficiency after gastric bypass
  • Gastric bypass vitamin deficiency treatment
Updated on January 3, 2019

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