Weight loss expert Dr Michael Mosley has given his top tips on how to lose a stone in just three weeks with a specific diet that bans some fruits.
Dr Michael lost 1.4 stone himself and managed to reverse his diabetes by changing what he ate and exercising more often.
The TV host now helps others to reach their weight loss goals of one stone in just 21 days.
READ MORE: Irish woman loses 13 stone in just over a year after overcoming life-long battle with food addiction
Dr Michael said: "Your waist should measure no more than half your height," reports Express.co.uk.
"Too much belly fat leads to increased risk of certain cancers, heart disease and Type 2 diabetes."
The doctor added that you "can take years off your life" by not changing this.
The expert provided his top tips on losing belly fat fast.
First, he said rapid weight loss is best achieved with a low-calorie, high-protein and low-sugar diet.
On the Fast 800 website, Dr Michael and his team compiled a list of foods that dieters can eat to lose weight fast before moving onto a Mediterranean diet, which he described as a "way of life".
It is recommended that dieters start their day off with eggs, as they are low calorie at around 63 calories.
Slimmers should then ramp up their protein intake, consuming foods such as oily fish, prawns, chicken and turkey.
For meat-free eaters, beans - particularly edamame - dairy, nuts and seeds can provide adequate protein.
Dieters should also stock up on healthy vegetables, and as Dr Michael said, the more colourful and varied, the better.
The expert also doesn't ban slimmers from eating fats.
He said it is essential to eat foods such as nuts even though they have a high-fat content because they are also rich in proteins, minerals and vitamins.
Full-fat yoghurt is also recommended and can be enjoyed with a handful of berries.
However, in order to lose up to a stone in three weeks, some foods must be limited or cut out altogether.
Dr Michael suggested banning super sweet fruits such as mango, pineapple and melon, opting for berries instead.
When craving treats such as ice cream, chocolate or cake, Dr Michael recommends having a square of dark chocolate instead.
He added snacks, on the whole, should be avoided, but if a slimmer must eat between meals, they should go for things like nuts, seeds, a sliver of cheese or non-starchy vegetables.
On Lose a stone in 21 days, some of Dr Michael's case studies lost weight by trying low-carb versions of their favourite foods - including takeaways.
While the steps are there to follow, rapid weight loss is not always easy.
One of Dr Michael's most important top tips is to stay accountable.
He said: "All the weight loss studies show that the people who keep it off are accountable to someone or something."
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