According to the Canadian Society of Intestinal Research, prolonged vitamin B12 deficiency can increase the likelihood of mental illness, damage neurones, and aggravate 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, arm or leg movement, sensation or balance.
The initial warning signs of B12 deficiency include:
- A pale yellow tinge to your skin
- A sore and red tongue (glossitis)
- Mouth ulcers
- Pins and needles (paraesthesia)
- Changes in the way that you walk and move around
- Disturbed vision
How to respond
See a GP if you’re experiencing symptoms of vitamin B12 deficiency, advises the NHS.
READ MORE: Vitamin B12 deficiency: Swollen tongue, lesions or a warm face could indicate low levels