Vitamin B6 status, deficiency and its consequences--an overview

Area of Science:

• Biochemistry and Nutritional Science
• Gerontology
• Public Health

Background:

• Vitamin B6 acts as a crucial coenzyme in over 100 biochemical reactions, including amino acid, glucose, and lipid metabolism, neurotransmitter synthesis, and DNA/RNA synthesis.
• While overt vitamin B6 deficiency is rare, subclinical deficiencies may affect certain populations, notably the elderly.
• Vitamin B6 also plays a role in modulating gene expression.

Purpose of the Study:

• To provide a comprehensive review of vitamin B6 metabolism and its interactions.
• To outline potential complications and deficiency symptoms associated with inadequate vitamin B6 levels.
• To explore public health and supplemental intervention strategies for vitamin B6 deficiency.

Main Methods:

• A systematic literature search was conducted using the Medline database.
• Keywords included "vitamin B6", "pyridoxal", "cancer", and "homocysteine".
• Studies spanning from the 1940s to 2006 were included and synthesized.

Main Results:

• Suboptimal vitamin B6 status is associated with increased risk of chronic diseases common in the elderly, such as impaired cognitive function, Alzheimer's disease, cardiovascular disease, and various cancers.
• Elevated homocysteine levels due to vitamin B6 deficiency may contribute to these health issues.
• Evidence suggests mechanisms beyond homocysteine are involved in the link between suboptimal vitamin B6 and chronic disease risk.

Conclusions:

• Suboptimal vitamin B6 status is a potential risk factor for several age-related chronic diseases.
• Further research into homocysteine-independent pathways is warranted.
• Public health and supplemental interventions should consider the elderly population and potential vitamin B6 insufficiency.