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Something I learned recently is that Brazil nuts have so much selenium that eating more than a few per day can be too much:
Health Benefits of Brazil Nuts
I previously read that vegans may not get enough selenium in their diets. But this page cites studies indicating it depends where ones lives, due to variable soil content, and that "Vegans in the U.S. appear to have adequate intakes of selenium": VeganHealth - Selenium
Health Benefits of Brazil Nuts
Eating too many Brazil nuts may also lead to selenium toxicity. Signs of selenium toxicity include:
Gastrointestinal problems
Dizziness
Brittle hair and nails
Joint pain
Irritability
Tiredness
In more severe cases, it may cause:
Kidney failure
Heart attack
Heart failure
Just one Brazil nut contains 96 micrograms of selenium, almost twice your daily requirement.
Doctors advise eating no more than five Brazil nuts a day to avoid potential health risks like selenium toxicity.
I previously read that vegans may not get enough selenium in their diets. But this page cites studies indicating it depends where ones lives, due to variable soil content, and that "Vegans in the U.S. appear to have adequate intakes of selenium": VeganHealth - Selenium