Singer and 'Fashion Police' co-host Kelly Osbourne has revealed that she discovered fad diets don't work because you only see them as temporary.

The star has lost an impressive amount of weight over the past two years and now boasts an enviable physique, but told the Huffington Post that it wasn't easy as it was a real overhaul of her lifestyle that worked rather than a quick solution:

"I learnt how to work out right and eat right, it’s one of those things that you just have to commit to a life change rather than being on a diet. Because a diet doesn’t work."

"You lose weight and you stop it and it will all come back. So you just have to take baby steps, commit to something and stay true to it."

She added that having a 'cheat day' can be effective, but sometimes the mantra of 'everything in moderation' can be tough to live by: "What are you going to do with a plate of french fries in front of you, moderate? No. You’re going to eat every single one of them!"