The Loose Women presenter, 39, gave up her favourite sweet treats as she suffers from sugar and dairy intolerance.
"I'd always had sugar cravings and have been a huge chocolate-lover since I was a teenager," she told Closer. "I kept a supply of bars hidden in my bedroom to satisfy my addiction.
"Even though it was making me ill, the taste and rush chocolate gave me was worth it."
Speaking about her her life post-hypnosis, McLean said: "I felt like I was dying for the first few days."
The former GMTV weather girl has recreated the famous nude American Beauty movie poster for the magazine shoot, but has replaced petals with chocolate buttons.