A society nutritionist who counts royals and A-list celebrities in her clientele has revealed her top tips for getting healthy and transforming your health within two weeks.

Speaking exclusively to FEMAIL, Gabriela Peacock, 41, who lives in Notting Hill with her husband and children revealed she advocates for a ‘champagne lifestyle with healthy tweaks’ for her array of high profile clients.

The Czech-born former model has a reputation for being a no-judgement nutritionist whose clients pay £270 a session to get results while still letting their hair down.

Now, she’s sharing her secrets in a new book- 2 Weeks to Feeling Great - advocating for the 4:3 diet - where people fast three days a week. The results speak for themselves, with her most successful client dropping 9lbs in two weeks. Her methods have been praised by her ‘BFF’ Princess Beatrice, as well as Jodie Kidd and Dame Joan Collins - with Tatler claiming the royal has her ‘on speed dial anytime she needs advice on looking and feeling fabulous’.

Princess Eugenie is believe to have leaned on Gabriela to slim down ahead of her nuptials and the health guru is also reported to have helped Prince Harry drop half a stone ahead of his big day. She was a guest at both royal weddings.

Beatrice herself said she ‘really likes the GP principles because they are effective and realistic guidelines to follow no matter what you are doing in the day’ while Dame Joan Collins added her tip of ‘combining fruit with protein such as live yoghurt really works for me and makes me feel energised and fabulous all day.’ Here she tells FEMAIL her top tips on feeling great and healthy...

Intermittent Fasting

Gabriela advocates for intermittent fasting. Her book has two plans - the 4:3 and the 16:8. On the 4:3 diet, women eat 500 calories three days a week and men eat 600. On three other ‘mindful days’ people reduce their normal calories intake by 20 per cent, and follow her ‘GP principles’ while one day a week is a ‘magic day’ with no rules. The other plan - 16:8 - is a more traditional intermittent fasting plan - where people fast 16 hours a day (including sleep) and eat over eight hours. ‘I find intermittent fasting is by far the best because you don’t need to go to the shops and buy a special food or pay a lot of money or pay someone.

‘What I love about it is just about when you’re eating and how you’re eating, and there are little tips around it.

‘What I would say is, I would always recommend for the clients, look at my two plans, and just see which ones fits best for your lifestyle. They’re both equally great they’re both based on intermittent fasting, but one will work better for you than other. ‘We also know intermittent fasting is a very, very healthy weight loss process.’

Don't eat fruit on an empty stomach

While many people grab a piece of fruit for a healthy breakfast, Gabriela says it’s not a good idea to eat it alone because it can cause a spike in blood sugar.

‘The first step I look at with every single of my clients is their blood sugar balance,’ she said. ‘You want to have a stable blood sugar levels throughout the day, and you don’t want to experience any spikes - which is a super rush - you don’t want to experience at the lows. ‘Because when you’re low, is when you feel tired and you can be grumpy’.

‘Fruit is fantastic if add some nuts and seeds with a small yoghurt, hummus and a piece on cheese. It will be much better for you because you’re combining the person and carbohydrate.’

Eat protein every few hours

‘Combining carbohydrates and proteins is really important. A lot of people just eat up carbohydrates, and they don’t think about the protein. ‘My practice is focused on protein with every single meal, even your snack. ‘As well as your protein, think about what kind of carbohydrates you’re eating. ‘Are you eating processed white bread or really nice rye bread or white rice or dark rice?

Balance your plate

Gabriela said that she always asks clients about portion sizes, but doesn’t want them to be ‘obsessive’. ‘People need to relax a little bit, and it’s all about the little bit of a common sense,’ she said. ‘Once you start thinking about eating too much, you could get obsessive and then you go the other way. You’re scared to eat everything, because it “may not be good for me”.’

She added that rather than obsessing over what’s good and bad, she advises focusing on the proportions of what’s on the plate. ‘Roughly, I’d recommend one quarter of your plate should be a good portion of protein - an animal source such as meat, fish, poultry, eggs, or a plant source such as beans soya bean chickpeas, lentils pulses,’ she said. ‘Then I would do another quarter of your plate, starchy vegetables or grains starchy vegetables like potatoes and sweet potatoes or a grain. Then half of your plate is vegetables.’