Is a banana radioactive🍌? 🍌 Yes, but everything is radioactive, including our own bodies. Bananas may be a little more radioactive than other foods since they are high in potassium, but many other foods are high in potassium – potatoes actually have more potassium than bananas. Our bodies need potassium to function properly, so go ahead and eat those bananas and potatoes. They’re not radioactive enough to be dangerous – in fact, they’re good for you!