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There is a little bit of antimatter in bananas.
A typical-sized banana releases about one particle of antimatter per hour. And, the reason that they do that is because they have a lot of potassium in them, which is one of the reasons that they are very good for you. And, naturally occurring potassium has some slight radioactivity. However, bananas are safe. You could not physically eat enough bananas to make the radiation dose come anywhere close to being remotely dangerous.
— Nick Hutzler, Education Ph.D., Harvard University, Physics