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Brazil Nuts Pack a Nutritious Punch

Brazil Nuts Pack a Nutritious Punch: Main Image
Research shows eating one Brazil nut a day can corrected selenium deficiency in women
The mineral selenium is essential for good health, and a recent study in Nutrition found that people with low blood levels were able to improve those levels simply by eating one Brazil nut a day.

Nutty nutrition

Though selenium deficiency is thought to be uncommon in the US, it is important to correct any deficiencies if they do exist. Selenium affects immune system and thyroid function and also works as an antioxidant, helping prevent conditions associated with oxidative stress such as heart disease and cancer.

In this study, 37 women who were deficient in selenium ate one Brazil nut a day (which provided 290 mcg of selenium) for eight weeks. At the end of the intervention, selenium deficiency had been corrected in all of the women.

“The essential micronutrient selenium functions as a component of many selenoproteins in antioxidant and redox reactions, thyroid hormone metabolism, immune function, and reproduction,” said Cristiane Cominetti, PhD and her colleagues from the Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Science, University of Sao Paulo, Sao Paulo, Brazil. “Disruptions in selenium status may result in suboptimal amounts of selenoproteins, which are associated with increased levels of oxidative stress and its related diseases.”

Sourcing selenium

  • Learn about selenium-rich foods. Brazil nuts are one of the top sources of selenium, but other good options include fish, poultry, meat, rice, and eggs.
  • Get your recommended daily allowance. A healthy non-pregnant adult does not need a lot of selenium to meet the RDA, which according to the Office of Dietary Supplements is 55 mcg per day; the highest amount an adult should take is 400 mcg per day. The women in this study were getting significantly more than the recommended daily allowance of selenium in order to raise selenium levels. The Office of Dietary Supplements points out that some Brazil nuts are unusually high in selenium (possibly with more than 500 mcg of selenium per nut), so they recommend eating Brazil nuts occasionally.
  • Eat a balanced diet. Eating a balanced diet that includes food sources mentioned above can help ensure you are getting enough selenium and other vitamins and minerals. Check with your doctor before taking a selenium supplement.

(Nutrition 2011 Jan 4 [E-pub ahead of print])

Jane Hart, MD, board-certified in internal medicine, serves in a variety of professional roles including consultant, journalist, and educator. Dr. Hart, a Clinical Instructor at Case Medical School in Cleveland, Ohio, writes extensively about health and wellness and a variety of other topics for nationally recognized organizations, websites, and print publications. Sought out for her expertise in the areas of integrative and preventive medicine, she is frequently quoted by national and local media. Dr. Hart is a professional lecturer for healthcare professionals, consumers, and youth and is a regular corporate speaker.


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