Vitamin B deficiency can cause anemia, walking and balance disturbances, can expose nerves to damage, cause a loss of vibration sensation, confusion and in some cases dementia. Vitamin B is naturally found in animal foods including fish, milk and milk products, eggs, meat and poultry. Signs of deficiency include: fatigue, weakness, nausea, loss of appetite and weight loss. Other symptoms are difficulty in maintaining balance, depression, confusion, and poor memory. To prevent a Vitamin B deficiency, supplementation is recommended for those with pernicious anemia and gastrointestinal disorders plus older adults (50+).