A Vegetarian Diet Significantly Changes Plasma Kynurenine Concentrations
Anne-Lise Bjørke-Monsen1,2,3, Kristin Varsi3, Arve Ulvik4
1Laboratory of Medical Biochemistry, Innlandet Hospital Trust, 2609 Lillehammer, Norway.
Biomolecules
|February 25, 2023
Summary
Vegetarians showed lower kynurenine levels and better vitamin B6 status compared to omnivores. This dietary difference may influence tryptophan metabolite levels and liver function markers.
Area of Science:
- Nutritional Science
- Biochemistry
- Human Physiology
Background:
- Tryptophan is an essential amino acid vital for producing key metabolites like serotonin and kynurenines.
- Dietary patterns, such as vegetarianism, can influence the metabolism of tryptophan and related compounds.
- Understanding these metabolic differences is crucial for assessing overall health and nutritional status.
Purpose of the Study:
- To compare tryptophan metabolites, vitamin B2 and B6 status, and biomarkers of liver function and inflammation between female omnivores and vegetarians.
- To investigate potential links between dietary habits and specific biochemical pathways.
Main Methods:
- Analysis of serum and plasma samples from 158 women (omnivores and vegetarians) aged 18-40 years.
- Measurement of tryptophan, kynurenines, vitamins B2 and B6, ALT, C-reactive protein, and neopterin.
- Statistical comparison of biochemical markers between vegetarian and omnivore groups.
Main Results:
- Vegetarians exhibited significantly lower plasma concentrations of most kynurenines (8-42% reduction) compared to omnivores.
- Vegetarians had 25% lower serum ALT and significantly higher pyridoxal (a form of vitamin B6) concentrations.
- No significant differences were found in vitamin B2 status or inflammation markers (C-reactive protein, neopterin).
Conclusions:
- Vegetarian dietary patterns are associated with lower plasma kynurenine levels and improved vitamin B6 status.
- Lower ALT levels in vegetarians suggest potentially better liver function.
- The observed metabolic differences warrant further investigation into their long-term health implications.
Keywords:
C-reactive proteinalanine transaminasekynureninesliveromnivoretryptophanvegetarianvitamin B6More Related Videos
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