Plantekost styrker immunforsvaret gjennom sink, selen og jern 
How common is zinc deficiency in vegans?
Based on serum zinc concentrations below 70 μg/dL, 11%, 51%, and 67% of omnivores, vegetarians, and vegans were deficient.
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https://veganhealth.org
Zinc - Vegan Health
The serum selenium concentrations varied between the four studied groups with the highest serum selenium concentrations in omnivores with a median of 62.85 μg/L and flexitarians at 61.37 μg/L, whereas the selenium levels of vegetarians and vegans were significantly lower at 55.12 μg/L and 52.84 μg/L ( p < 0.001), respectively.





