Fergie admits that she now uses music to "fulfil" her in the way that drugs once did.
The singer battled an addiction to crystal meth in the past and now thinks it's "imperative" that addicts find different outlets so that they can stay sober.
Asked about just that, she told the Guardian newspaper: "Absolutely. You have to. It's imperative that you find something that's going to fulfil you in that way, and for me it was making music and getting my thoughts out. Absolutely."
As well as relying on her music, Fergie undergoes regular hypnotherapy sessions and finds the treatment very effective.
"It works. My girl is a trained therapist - it's not just some flighty person who hypnotises people.
"It's normal therapy and at the end, you go into a more relaxed state where she can speak to my subconscious. I just get very relaxed and it's almost a dream state, so you're highly suggestible at that point.
"It's weird, I will hear her voice sometimes later on. I've done hypnosis for eating and I'll be lying there, she'll be putting her positive suggestions in and later on, I'll go to the refrigerator and I'll hear her voice telling me to be sensible."
One way in which she is sensible is with some choices of food.
"My breakfast is a green smoothie every day and I'm sipping it right now. It's kale, spinach and romaine. What saves it is there's half a banana, half an apple and half a pear in it."
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