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Several studies showed that people who had diets low in selenium showed more frequent mood swings and a greater frequency of panic attacks and depression episodes.

Selenium is a trace element that is vital for the proper functioning of your body. It is essential for your thyroid and influences your immune system and cell growth.

Brazilian nuts are selenium superstars and contain the highest levels of selenium of any food. Eating 2 to 3 brazil nuts provides your recommended daily intake of this important mineral. 

However, please take note that too much consumption of Brazil nuts is not recommended because high levels of selenium in the body may cause a few side effects. The recommended upper limit for selenium for an adult is 400 microgramsTrusted Source (mcg) per day. With that in mind, limit your consumption to only 2 to 3 Brazil nuts daily.

Source: PubMed