Brazilian adults who drink alcohol tend to consume about 4.38 micrograms more selenium per day than those who do not drink, likely because their diets include more selenium-rich foods like meat and fish.

In Brazil, people who currently smoke consume about 7.77 micrograms less selenium per day than those who have never smoked or have quit, suggesting their diet tends to include less selenium-rich foods.

In Brazilian adults, people who consume more selenium tend to be women, older than 60, have higher income or education, drink alcohol, or engage in regular physical activity. People who consume less selenium tend to have non-white skin color or smoke.

People in Galicia, Spain, who eat more seafood tend to have higher levels of selenium in their blood, and those with sufficient selenium levels typically eat about four servings of fish per week.

In Brazilian adults, the majority of selenium intake comes from nuts, cooked fish, and boneless meat, with nuts providing nearly 29% of total selenium consumption.