8. Octopus and Squid
These two are usually eaten for their high protein and low fat contents. If you love a serving of calamari, keep eating. You are getting a lot of selenium from it. Just 100 grams will give you up to 170 mcg. The calories might be a bit high, but if your body needs more selenium, it would be worth the risk.
9. Mushrooms
Almost all types of mushrooms are rich in selenium. It is up to you to decide which one to try. You can have them eaten as a side dish or you can mix them up with the main dish. The selenium content is just 11.5 mcg per 100 grams though so you need to eat more. However, it is fine since you are getting a lot of other nutrients anyway.