Gastric bypass and other types of bariatric surgery dramatically alter your body’s ability to absorb vitamins, minerals and nutrients from the smaller amounts of food you’ll be eating. The resulting vitamin and mineral deficiencies can have serious medical implications.
Low calcium levels can occur after gastric bypass. Since most calcium in the blood is bound to protein, anyone who has protein deficiency after gastric bypass is likely to have a low total calcium level on standard blood tests.
Folic Acid Deficiency
This is the least common of the recognized vitamin deficiencies after gastric bypass surgery. It occurs in fewer than 1% of the patients.
This is the most common deficiency seen in our patients after gastric bypass surgery. Conversely, it is the most common deficiency seen in our patients before the operation.
Vitamin B1 Deficiency
B1 deficiency is rare after weight loss surgery, however, it can become important with generalized malnutrition or other medical problems (e.g. alcohol abuse).