grape fruits and singing vocal chords?

Question

is eating grape fruits and drinking grape fruit juice bad cause of the sour and tart flavor? for your vocal chords i mean.

Answer 1

No.

Answer 2

No, as a mater of fact, when I was in school my teacher use to give us a slice of lemon to suck on before we would start singing.
She always told me that it help make the volcal cords more flexable.