After irradiating food, do you still think it is nutritious?

No because Ionizing radiations can alter the structures of organic and biochemical componds essential to normal life when these radiations are recieved in high dosage. In foods just as excessive amounts of heat deteriorate foods nutritionally, excessive dosages of radiation adversely affects proteins, carbohydrates, fats, vitamins, pigments, flavours, enzymes and so on.