According to the Canadian Society of Intestinal Research, prolonged vitamin B12 deficiency can increase the likelihood of mental illness, damage neurons and worsen multiple sclerosis (MS).
MS is a condition that can affect the brain and spinal cord, causing a wide range of potential symptoms, including problems with vision, movements of arms or legs, sensation or balance.
The initial warning signs of B12 deficiency include:
- A light yellow tone on your skin
- Sore and red tongue (glossitis)
- Mouth ulcers
- Pins and needles (paresthesia)
- Changes in the way you walk and move
- Disturbed vision
- Irritability.
How to respond
Consult a general practitioner if you have symptoms of vitamin B12 deficiency, advises the NHS.
READ MORE: Vitamin B12 deficiency: swollen tongue, lesions or a hot face may indicate low levels