Stated by researchers to cause: 
- Fatigue
- Lethargy 
- Depression
- Poor memory 
- & is associated with mania and psychosis

Vitamin B12 Deficiency

Deficiency in thiamine (vitamin B1), is stated by researchers to cause beriberi with numbness as CNS symptom (which disrupts motor functioning) as well as Wernicke’s encephalopathy.

Thiamine Deficiency

According to researchers, folic acid (vitamin B9) deficiency has detrimental effects on neurodevelopment in utero and in infancy; and deficits are associated with a greater risk of depression during adulthood.

Folic Acid Deficiency

Deficiency in niacin (vitamin B3), is said to cause Pellagra with dementia as a result.

Niacin Deficiency

Highest impairments in cognition are caused by deficiencies in:
- Vitamin B12
- Thiamine
- Folic Acid 
- Niacin

Saint Louis University

Several studies have reported strong correlations between a healthy diet and mental health. For example, increased consumption of a diet rich in fresh fruits and vegetables has been associated with increased reported happiness and higher levels of mental health and well-being. 

Correlations Between Diet & Mental Health

Adan, R. A., van der Beek, E. M., Buitelaar, J. K., Cryan, J. F., Hebebrand, J., Higgs, S., ... & Dickson, S. L. (2019). Nutritional psychiatry: Towards improving mental health by what you eat. European Neuropsychopharmacology, 29(12), 1321-1332.

Nutrition Psychiatry: Towards Improving Mental Health by What You Eat

Studies have revealed: 
-  A reduced likelihood of depression is associated with increased intake of a ‘healthy diet’, defined as a diet high in fruit, vegetables, fish and whole grains.
- A reduced risk of depression is linked with adherence to the Mediterranean diet.
- A Mediterranean diet can confer a protective effect against depression.
- Dietary interventions hold promise to reduce depression incidence.

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