Deficiency
Vitamin B12 deficiency
Nerve and blood-cell effects from low B12, common in older adults due to reduced absorption rather than low intake.
Symptoms
- numbness or tingling in hands/feet
- fatigue
- memory problems
- balance issues
- pale or jaundiced skin
These overlap with plenty of other conditions. Only a blood test can confirm a deficiency — treat this as a prompt to ask your doctor, not an answer.
What happens
Low Vitamin B12 impairs red blood cell formation (causing a form of anemia) and, if prolonged, can damage the myelin sheath protecting nerves — this second effect is why symptoms can include numbness, balance problems, and cognitive changes, not just fatigue.
Who’s at risk
Elderly adults are disproportionately affected: reduced stomach acid production impairs the release of B12 from food, even when dietary intake looks adequate on paper. People on long-term plant-based diets without fortification or supplementation are also at risk.
Dietary approach
Because the deficiency is often about absorption, not intake, addressing it may require a fortified food, supplement, or B12 injections rather than diet changes alone — worth a conversation with a doctor rather than self-diagnosis.
Citations
[1] NIH Office of Dietary Supplements — Vitamin B12 fact sheet.