Vitamin B12 Deficiency

Vitamin B12 deficiency occurs when your body lacks adequate amounts of this essential vitamin, which is crucial for nerve function, DNA synthesis, and the production of red blood cells. B12 is unique among vitamins because it can only be obtained from animal products or fortified foods. Your body stores several years' worth of B12 in the liver, so deficiency develops slowly over time. However, once symptoms appear, they can be significant and may include both physical fatigue and neurological problems. The vitamin plays a critical role in converting food into glucose for energy, maintaining the myelin sheath that protects nerves, and producing healthy red blood cells that carry oxygen throughout the body.

B12 deficiency can occur for several reasons: 1. Dietary Insufficiency: Vegans and vegetarians who don't supplement are at high risk since B12 is only naturally found in animal products 2. Pernicious Anemia: An autoimmune condition where the body attacks cells that produce intrinsic factor, necessary for B12 absorption 3. Malabsorption: Conditions like celiac disease, Crohn's disease, or bacterial overgrowth in the small intestine 4. Medications: Long-term use of metformin or proton pump inhibitors can reduce B12 absorption 5. Age-Related Changes: Older adults often produce less stomach acid, which is needed to release B12 from food Without adequate B12, your body produces abnormally large red blood cells (megaloblastic anemia) that don't function properly, leading to fatigue and other symptoms.