New research suggests that some vegan diets may fall short on iodine. Researchers from the Mayo Clinic in Jacksonville, Florida assessed urinary iodine levels in 78 vegetarians and 63 vegans. Average levels were 147 micrograms per liter in the vegetarians and 79 micrograms in the vegans. The World Health Organization has established 100 to 199 micrograms as a safe range for urinary iodine levels.
Although studies in Europe have found low iodine in vegan populations, this is the first to assess iodine status among American vegans.
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