The 59-year-old gave up meat and diary products after being diagnosed with type 2 diabetes and is now a strict vegan.
"I had type 2 diabetes and high blood pressure. So I went on a radical change in lifestyle. I was on liquids for a year, and that gave me a good jump-start," Khan said.
"It sort of changed my whole way of thinking. You have to get the mindset."
Her new diet, combined with regular exercise sessions, has led to a dramatic improvement in health and allowed the singer to ditch her type 2 diabetes medication .
Various studies have shown that healthy vegan diets can improve blood sugar control, particularly when combined with regular physical activity .