In the case of pronounced absorption disorders, for example as a result of gastritis or after removal of the small intestine, in Crohn's disease, diverticulosis and the so-called blind-loop syndrome, there is a gradual decrease in the vitamin B12 store in the liver, which can turn into a manifest vitamin B12 deficiency
Any perceived weight loss benefits likely result from correcting an underlying deficiency causing fatigue, rather than from direct fat-burning mechanisms
These side effects are usually temporary and subside on their own
A note on the absorption of fat
Vitamin B12 (cobalamin) deficiency: Can cause pernicious anemia, characterized by a decrease in the number of red blood cells and symptoms such as fatigue, muscle weakness, dizziness and memory and concentration problems
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