 In adult birds, the disease is incurable and usually leads to an early death, as affected birds are rendered effectively or totally flightless.In young birds, wrapping the wing and binding it against the bird's flank, together with feeding the bird a more nutritionally balanced diet, can reverse the damage.The theorized causes of angel wing are genetics, the excessive intake of carbohydrates and proteins, together with insufficient intake of vitamin E, low dietary calcium and manganese deficiency.