The 68-year-old soul singer was hospitalised last year for a mystery illness, and although she still refuses to talk about why she needed surgery, she has opened up about the benefits of the operation.
Talking to Access Hollywood she said that her doctor told her, ''the surgery that you just had is going to add 15 or 20 more years to your life.''
And she said that she is hoping to keep the weight off that she lost throughout her illness.
'I plan to maintain and keep this weight that I have now. I'm so happy with it,' she added.
She had been forced to cancel all performances until May and said that after that, she plans to reschedule the concerts that she pulled out of last year.