A new wonder diet has been unveiled that involves eating three types of vegetables and swimming with friends.
However the pound-busting scheme at Great Yarmouth's Sea Life Centre is only for those of a reptilian persuasion who like long dips in water.
The four month diet and exercise regime has been enjoyed by Noah the green sea turtle, who had been putting on the pounds by cheekily eating shark food in the centre's main tank.
Noah's new regime, which saw him munching on spinach, broccoli and kale and enjoying swims with centre divers, has led to him being crowned a slimming success.
A special weigh-in at his tank saw the turtle record a weight of 90kg, where before Easter he had weighed 95kg.
One of the aquarists who helped weigh Noah was Shane Breadmore, who said: 'He had a little bit of excess weight.
'He was slightly overweight by five to 10kg and we put him on a diet to try and shed a few pounds.
'And it has worked.
'He weighs 90kg now and he was 95 before. So that is absolutely brilliant news for us.
'Noah's diet consists of a few portions of veg a day and a few exercises in the tank, swimming around with me.
'The benefits are is he is more active.
'At a lower weight he is at peak performance.'
To help launch his diet, Noah, who has the nickname Naughty Noah for his cheeky behaviour, was given special Easter eggs made of green low calorie, turtle friendly jelly with vegetable delicacies, including broccoli, spinach and kale, set in their centres.
However while staff are happy with the results of the diet, they admit that perhaps Noah could keep his new fitness regime going.
Maxine Culleton, Sea Life's marketing manager, said: 'He still has muffin tops so he does need to keep fit and we are going to keep doing what we are doing.
'The reason he had put on weight is he was eating too much and was eating the sharks' food.
'We are all really pleased with Noah's weight loss.'
Noah shares his 250,000 litre tank with black tip reef sharks and tropical fish and one of his favourite things had been to steal the sharks' squid at feeding times.
He had also been known to cheekily butt and nip staff during training sessions.
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