You can’t go more than a few minutes watching TV without seeing a celebrity looking fit and lean, who stands confidently next to an unflattering photo of what she looked like before the miracle celebrity diet changed her life. But you rarely see what happens once the cameras are turned off, and the celebrity has to turn a diet into a lifestyle, which is the big challenge. So with that in mind, here are some of the most noticeable celebrity diet fails of the past few years.

Kelly Clarkson

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Clarkson burst on the scene on “American Idol” in 2002, winning the inaugural season of the singing competition, and wowing fans with her vocal range. But soon after her triumph, Clarkson began battling with weight issues, admitting in interviews that she was finding it hard to control her eating habits. Clarkson finally decided to do something about her weight issues, and three years ago, she went on a high protein, low carb diet that included five days a week of exercise. And while Clarkson showed off her new, slimmer figure on the cover of PEOPLE, it didn’t take long for her to go back to her yo-yo weight fluctuation. Now, after giving birth in 2014, Clarkson’s weight is off the charts again, proof that dieting isn’t a fad, but a lifestyle.