Vanessa Feltz's weight loss and gain

Yo-yo dieting just isn't fun – and it can affect your long-term health. Think about it: if you radically alter your eating habits, it's likely that you'll be unable to maintain them, and you'll return to your regular diet.

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And with that comes the pounds - except this time they cling all the more tenaciously to your hips!

- So, which celebs struggle to keep the pounds off for good?

There is an upside. When we're feeling blue about weight gain, it's heartening to find that our favourite celebrities also feel the 'pinch' now and then too.

Intermittently, these luminaries work their butts off and look stunning, but just as often the lure of the drive-in burger joint is too much. All the money and trainers in the world are not a guarantee against keeping off the pounds.

- Take a look at these bouncing celebs