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Dietary protein as a factor affecting vitamin B6 requirement
M Okada1, M Shibuya, T Akazawa
1Faculty of Health and Living Sciences, Naruto University of Education, Japan.
Journal of Nutritional Science and Vitaminology
|May 20, 1998
Summary
High-protein diets increase vitamin B6 requirements in rats. Optimal vitamin B6 (B6) levels depend on dietary protein, with enzymatic activity indicating higher needs than tissue B6 content alone.
Area of Science:
- Biochemistry
- Nutritional Science
- Animal Nutrition
Background:
- Dietary protein influences nutrient metabolism.
- Vitamin B6 (B6) is crucial for numerous enzymatic reactions.
- Understanding B6 requirements is vital for animal health and feed formulation.
Purpose of the Study:
- To determine the minimum vitamin B6 (B6) requirement in rats fed varying protein levels.
- To assess the impact of dietary protein on B6-dependent enzymatic activity.
- To evaluate B6 vitamers in plasma as indicators of B6 status.
Main Methods:
- Rats were fed diets with 20% or 70% casein and supplemented with pyridoxine (PN).
- Tissue B6 content and B6-dependent enzymatic activity were measured.
- Plasma B6 vitamer levels were analyzed to assess B6 status.
Main Results:
- Hepatic B6 content suggested adequate B6 at 1.45 mg PN/kg (20% casein) and 2.90 mg PN/kg (70% casein).
- PLP-enzymatic activity indicated a need for approximately double these PN levels in both diets.
- High-protein diets demonstrably increased the B6 requirement.
- Plasma B6 vitamer levels were sensitive to B6 status, but optimal levels remain undetermined.
Conclusions:
- Dietary protein significantly impacts vitamin B6 requirements.
- Enzymatic activity is a more sensitive indicator of B6 adequacy than tissue B6 content.
- Further research is needed to establish optimal plasma B6 levels for assessing nutritional status.