Quote from article:
Plants are the major source of selenium, but the amount of selenium in food depends on the amount of selenium in the soil where the plants are grown. Although our diets provided enough selenium in the past, soil in some areas is becoming depleted, and a diet high in processed foods may mean that you're not getting enough.
The articla also failed to mention the biggest benefit of all...preventing myopathy heart attacks.
Everyone should be taking selenium, along with the other 59 minerals.