The Brazilian nuts originates from the Bertholletia excelsa tree, a member of the Lecythidaceae botanical family found in the Amazon rainforest. Recognized as the premier natural source of selenium in our diet, this seed offers various health benefits.

Renata Guirau, a nutritionist at Oba Hortifruti, highlights selenium's roles in antioxidant functions, immune support, central nervous system health, and enhancing skin, nails, and hair quality. While selenium is present in other foods like meat, seafood, and vegetables, both deficiency and excess can pose health risks.
As for the daily consumption of Brazilian nuts, an average unit in Brazil contains 50mcg to 100mcg of selenium, whereas the recommended daily intake for adults is 55mcg. Surprisingly, just one or two nuts can suffice.
Renata warns against consuming over 400mcg of selenium daily, as chronic excessive intake can lead to selenosis. This condition involves selenium toxicity, potentially occurring over extended periods and varying between individuals.
Exceeding 900mcg of selenium daily, equivalent to 9-18 nuts depending on size, may result in symptoms such as fatigue, muscle pain, hair loss, gastrointestinal issues (vomiting and diarrhea), and central nervous system disturbances. In the long term, severe consequences like depression, heart problems, and kidney failure may manifest.
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