WARNING: Individual intake should be limited to one to three a day because excessive amounts of selenium have been linked to increased risk of diabetes and prostate cancer.

Brazil nut (Bertholletia excelsa) (español: nuez de Brasil) is a South American tree in the family Lecythidaceae. Brazil nuts are rich in healthy fats, selenium, magnesium, copper, phosphorus, manganese, thiamine, and vitamin E. Among the claims for Brazil nuts are that they may support thyroid, heart, and brain function, and reduce inflammation.

1 ounce (28 g) Brazil nut
calories 187
carbohydrates 3.3 g
copper 55% RDI
fat 19 g
fiber 2.1 g
magnesium 33% RDI
manganese 17% RDI
phosphorous 30% RDI
protein 4.1 g
selenium 175% RDI
thiamine 16% RDI
zinc 10.5% RDI
vitamin E 11% RDI
Sources: Wikipedia / healthline