Vision problems can also be a sign of Vitamin B12 deficiency. The vitamin is vital for maintaining healthy optic nerves.

In contrast, lower than normal levels are referred to as a serotonin deficiency. A deficiency causes several physical symptoms, including insomnia, carbohydrate cravings, fatigue, nausea ...

Foods rich in tryptophan may boost the production of serotonin in the brain. These foods include eggs, some cheeses, and turkey. Serotonin is a natural neurotransmitter (brain messenger ...

However, its deficiency often happens because these symptoms can resemble other occurrences ... Vitamin D plays a role in controlling the serotonin content in the brain that contributes to a ...

including dopamine and serotonin. This condition is caused by mutations in the DDC gene, which encodes the AADC enzyme. The deficiency leads to a range of neurological and behavioral symptoms ...