Certified Nutrition Specialist (CNS) Practice Exam – Prep & Study Guide

Vitamin B12 deficiency is primarily linked with specific hematologic and neurologic conditions. Pernicious anemia is an autoimmune condition that impairs the absorption of vitamin B12, leading to anemia characterized by large, immature red blood cells. Neuropathy, often associated with vitamin B12 deficiency, can manifest as tingling, numbness, or weakness due to its role in maintaining the health of nerve cells.

Foot strike anemia, though less commonly discussed, can occur in individuals who engage in high-impact activities and is associated with the destruction of red blood cells, which can be exacerbated by nutritional deficiencies, including that of B12.

In contrast, iron deficiency anemia is distinctly separate from vitamin B12 deficiency. It arises due to inadequate iron levels necessary for hemoglobin production, resulting in reduced oxygen-carrying capacity of the blood. While both conditions result in anemia, their underlying causes and nutritional deficiencies differ significantly. Thus, iron deficiency anemia is not directly associated with a deficiency of vitamin B12, making it the correct choice in this context.