A patient with a history of gastric bypass surgery presents with symptoms of fatigue, weakness, and shortness of breath. What is the most likely nutritional deficiency causing these symptoms?

A Vitamin B12 deficiency ✓
B Iron deficiency
C Folate deficiency
D Thiamine deficiency

Explanation

Gastric bypass surgery can lead to malabsorption of nutrients, including vitamin B12. Vitamin B12 deficiency can cause fatigue, weakness, and shortness of breath due to its role in the production of red blood cells.

Source

UpToDate Clinical Decision Support
Metabolic and Nutritional Disorders Nutrition and Gastrointestinal Surgery Post-Bariatric Surgery Complications Hard MEDICAL Confidence: high