A subtle change to your tongue could be one of the earliest symptoms of a vitamin B12 deficiency.
You may find that your tongue is particularly swollen, or it changes colour.
The swelling may be quite painful, and it may appear that your taste buds have disappeared.
Blurred vision could be caused by not having enough vitamin B12 in your diet.
It’s linked to nervous system damage in the optic nerve, which leads directly to your eyes.