Plants should make up the majority of a healthy diet, and that includes plants that are taken from under the ground. Although high in carbohydrates, black radishes are also full of nutrients, including potassium, magnesium, iron, and vitamins A, B, C, and E. In many cultures they are believed to fight off infection and to help improve digestion. Although folklore can hardly stand up to scientific study, similarities found across generations usually have a solid foundation, especially when it comes to the food we eat.
Paleo and Carbohydrates
While those trying to maintain an extremely low-carb diet might want to avoid root vegetables, including radishes, many of us can handle a few without any negative effects. For those of us who require a diet that is slightly higher in carbohydrates, or have just finished a hard workout, radishes can be an excellent, Paleo-friendly source of those carbohydrates.
Despite their high carbohydrate content, Mark Sisson has touted the health benefits of radishes. You can read his thoughts on the root here.