The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
People that consume alcohol or vegetarian may require more zinc. Alcohol increases zinc excretion by 50%. Vegetarians are getting their zinc from plant sources, which has zinc bound to phytate and lowers its bioavailability. Vegetarians are getting their zinc from plant sources, which has zinc bound to phytate and lowers bioavailability.
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alcohol causes us to absorb less zinc in the intestine and excrete more zinc in urine this is a double whammy for this micronutrient because we both absorb less and exre more heavier alcohol use is definitely associated with pore zinc status between 30 and 50% of people with alcohol use disorder have low zinc status
however moderate alcohol use may have a milder effect on zinc losses in either case regular consumption of alcohol probably increases the need for more zinc in the diet or supplemental Zinc at least slightly in people who are low or moderate consumers
also remember that alcohol increases zinc excretion by up to twofold so this is another reason to make sure you are replenishing your zinc stores while consuming alcohol