A doctor has warned that a certain vitamin deficiency could lead to "memory issues, confusion, or cognitive changes", as well as some painful problems with your mouth. These signs might suggest a lack of vitamin B12 in your system. We rely on a range of vitamins and minerals, ideally obtained from a balanced diet, for our overall health . A deficiency in these vital nutrients can impede the body's ability to function properly. Vitamin B12, primarily found in animal products such as meat, cheese,