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"Feel at Your Best with Support from a Registered Dietitian."

Trusted by 10,000+ clients for weight loss, gut health, diabetes management, paediatric nutrition & more – available in-person or online.

AWARD WINNING DIETITIAN & NUTRITIONIST CONSULTANCY COMPANY
Best Dietitian in London

MULTI-AWARD WINNING DIETITIAN & NUTRITIONIST CONSULTANCY COMPANY. 

Welcome to Dietitian Fit

THE BEST PRIVATE DIETITIAN AND NUTRITIONIST TEAM IN THE UK NEAR YOU

At Dietitian Fit, we treat and care for each customer as if they were a family member. We take pride in providing the greatest care and highest levels of service to our client. 

As private dietitians and nutritionists, we will do everything in our power to make sure you achieve your goal in the most efficient and sustainable way possible. 

Whether you need help with weight loss, sports nutrition, plant-based diet, child nutrition, IBS, diabetes or any other health-related condition, one of our specialist dietitian or nutritionist near will develop a personalised plan to make you reach your objective.

We are based in London and other locations across the UK. We also offer online consultations. Wherever you are, you can find one of our dietitian near you.  

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Trusted by thousands of clients, GP clinics, the NHS over 50 GPs, Universities, sports and fitness clubs, and magazines choose our dietitians and nutritionists for the quality of our services. This includes our one-to-one consultations, corporate events such as webinars & conferences, writing articles, and more.

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ExcellentDietitian Fit - Nutritionist & Dietitians5.0★★★★★ Based on 165 reviews fromSee all reviews review us onK L.K L. ★★★★★ Marizaan’s support has been invaluable. Her understanding of both my health and caregiving challenges has made a profound difference. After eight years of constant stomach pain, her advice has given me pain-free days—nothing short of a miracle. Her alternative recipes have improved my digestion and energy, helping me identify trigger foods for better dietary choices.What sets her apart is her compassion and patience. She always listens, never rushes, and makes me feel truly valued. Her dedication, especially in guiding me through technology and the app, is deeply appreciated.Callum J.Callum J. ★★★★★ Informative and understanding, really supportive with any questions I had. Helped me meet a weight category effortlessly. Would highly reccomend to anybody who wants to improve their quality of life.Madlne A.Madlne A. ★★★★★ I would like to take a moment to sincerely thank Katerina Ageridou, who has been my nutritionist for the past two months. When I first came to her, I had two main goals: to improve my reflexes and to lose weight. I’m incredibly happy to say that not only did I learn how to manage and enhance my reflexes, but I also lost almost four pounds.More importantly, I gained a deep understanding of the many health benefits that come from proper nutrition. Katerina is not only a knowledgeable and intelligent professional but also a fantastic practitioner who truly cares about her clients. I highly recommend Katerina Ageridou to anyone looking to improve their health and well-being through nutrition!Khyle A.Khyle A. ★★★★★ I've been working with Isabella for a little while now and she's been incredible. Super knowledgeable and easy to talk to—she’s helped me really understand how my food choices affect my body, energy, and goals. I’ve seen real progress thanks to her guidance. Highly recommend!David B.David B. ★★★★★ I had a great experience working with Kat for three months to help embed new healthy habits. Kat provided encouragement and guidance throughout and was always very responsive when I contacted her between sessions.I was already fairly well-informed about diet and nutrition but have struggled to consistently incorporate what I know into how I behave. I now feel more empowered than ever, armed with the knowledge of how to make better choices consistently, how to think about my long-term health rather than short-term weight loss goals, and how to stay in control even after periods where I am not so strict with my routine (e.g. vacations).Thanks to Kat, I didn't just lose weight and improve behaviors during our time together, I know I've changed my mindset permanently. Definitely worth it!Aisling W.Aisling W. ★★★★★ I recently finished a 6 month plan with Kat, with my partner. I would recommend Kat to anyone and everyone. We approached her with different needs and requirements, and Kat was incredible in sitting with us separately and together, working with us to get to where we needed to get.Kat helped me with my relationship with food and working on fixing my outlook and how I dealt with certain triggers. She sat with me through difficult phases of the journey, and I never felt shame or judged when opening up about my struggles. Kat was honestly fantastic.Working with my partner, she listened to what he needed and worked with him on adjusting some overall lifestyle habits while making sure his relationship with food remained healthy.Kat was amazing in setting us up with a HUGE advantage in being able to live in a healthier lifestyle and being able to stand on our own two feet. She set us up with such a great support system and being able to dealing with whatever life throws at us.Our lives have definitely improved and we feel a lot healthier. Even though we still have a bit to go, Kat was fundamental in getting us on the right path and making us feel like us again. She was able to work with us as a couple while both of us had different needs and relationships with food and how we ate.Hannah A.Hannah A. ★★★★★ Isabella listened to our needs and created a personalised plan suiting our tastes, timings and really tweaked our eating habits for the better. Thanks for giving me the confidence to fuel my sporty kids witb the right things at the right times!Sarah O.Sarah O. ★★★★★ Lots of helpful ideas and advice for losing some weight but also more generally for eating more healthily and getting more veggies into my diet.Lucy WLucy W ★★★★★ I am very impressed with the advice we had from Alicia Du Preez. She quickly understood our problems and offered lots of helpful non judgemental advice. I felt reassured after the two sessions we had with her.I wouldn't hesitate to recommend her for help with children and fussy eaters.Konstantina M.Konstantina M. ★★★★★ I had sessions with Kat for 6 months. She helped me gain a whole new perspective about eating habits. She was very positive throughout this journey by encouraging me and giving me tips that were easy to follow. After 6 months my health and overall lifestyle have improved a lot! I would definitely recommend Kat!Anna-Luisa F.Anna-Luisa F. ★★★★★ Kat is incredible. She’s kind and compassionate and inspired me to really give my best to the process. She’s knowledgeable and had a vast wealth of resources to support me. Highly recommend.Regina B.Regina B. ★★★★★ Grateful to have crossed paths with Isabella. We rate highly her calm and supportive approach.Jade H.Jade H. ★★★★★ Isabella is an excellent dietitian. She helped me return to my normal weight in a healthy way after struggling to lose weight for years due to some health issues I was experiencing. I’ve been able to get into a habit of healthy eating and exercise thanks to my regular meetings with Isabella and the meal plan she provided me with. I finally feel confident again, and I couldn’t thank Isabella enough. I would definitely recommend her!Lina V.Lina V. ★★★★★ I started working with Kat over the summer for about 3 months. After many many different tries with different dietitians, programs, workouts, etc. I was able to reach my 1st wieght loss milestone. More importantly Kat brought a huge change for me, she taught me how to properly eat well without missing out on anything!!!!! Stay energetic and full at all times. And I mean that! Worth noting that there was  plenty of travel in between sessions and Kat really supported me with my eating habits. Finally, during the 3 months I saw a major change with my gut and how I was feeling. I didn't feel bloated anymore or suffer from IBS symptoms. Thisbwas the reset I needed, and I really wish I had reached out earlier.  THANK YOU SO MUCH!!Laura Z.Laura Z. ★★★★★ I worked with Kat for about 6 months, and I found her to be a truly kind and professional person. She is warm, friendly, and approachable, and all of her advice was incredibly helpful. Kat is very calm, and the way she explains everything makes it easy to understand that eating can be an enjoyable experience. You can eat and lose weight at the same time, with no effort. I highly recommend Kat to everyone.AK P.AK P. ★★★★★ I can only sing praises for Kat, she really has helped me transform. I have been struggling with disordered eating for many years which is why I started working with Kat. There is still some work I have to do but after working with her for a few months now not just my relationship with food but my outlook on life in general has significantly changed due to her warm and understanding attitude. It has helped me to fully open up to the process of unlearning and I feel so much more free. I highly, highly, highly recommend working with Kat or Dietician Fit in general!Hayley M.Hayley M. ★★★★★ I work with Kat for 3 months and felt so much more positive about myself - weight loss, more energy, more confident. I leant how to properly fuel my body and stay fuller for longer to curb those cravings! Kat was really lovely and I thoroughly enjoyed each session. I would highly recommend this service and hope to have a few more sessions in the New Year to make sure I am still on track!Tashiya M.Tashiya M. ★★★★★ As part of my on-going self learning and improvement, I found Isabella, a Performance Dietitian, who is based in London but has her own Singapore connection! I was able to work with Isabella over the last 3-4 months on truly breaking down my nutrition, especially in relation to optimising playing tennis and the gym-routine that works around that. "Eating more & sufficient recovery time" have been key parts of this learning experience, which I look forward to building on moving forward. Thank you, Isabella for listening and working with me.Alicia Porras L.Alicia Porras L. ★★★★★ I cannot be happier and appreciate more all the guidance that Kat has been giving me during these past couple of months. In a moment of stagnation, when I felt that for more than I trained or tried to eat well my weight kept fluctuating, I was recommended to contact Dietitian Fit, and chose Kat specifically because I needed a healthier relationship with food and to improve my mindset in general in terms of eating. I had eating disorders in the past and I've never felt as good with myself as I feel as of today. After two months, I lost 5.5kg of fat and gained an immense amount of confidence, I can finally see my muscles popping and my body feels great in general. This is not a diet, this is a lifestyle, and you learn how to eat consciously by respecting your own meal choices and taste without feeling you're sacrificing anything, because you don't. I've been a few times on holidays during this period of time and still managed to be in control with my body and mind, and losing fat. Kat is a brilliant, lovely professional and I cannot be more grateful of all I've learned thanks to her. Definitely recommended. 💖Lenus B.Lenus B. ★★★★★ Hello healthier people!I just want to say how amazed and greatful to my dietitian Marizaan I am!She been kind, thoughtful, understanding and very patient with my journey from a food addiction person with huge health problems and feeling constantly that I will die to a new me today who lost 8 kg in 3 months and 6 cm from waistline giving me the confidence of 20 year old who will live well over 100!I am a health professional and I proud myself with lots of knowledge including some in nutrition but I realised during these 3 months how many mistakes I was making and learned a lot! Today was my last session but as I am still finding my feet around nutrition and diet I decided to extend it for another 3 months! Hope at the end to be the new fully healthy and disciplined one! Bonus, stopped so many medications! Good luck! I sure feel top of the world! LenusLouise E.Louise E. ★★★★★ Matt R.Matt R. ★★★★★ Isabella provided me with a friendly professional service, she took the time to assess my personal and professional circumstances and created the best plan to suit me, always on hand to answer any follow questions and adjust any details to my plan. Making it a great service but also an enjoyable straightforward process, highly recommend.Jose G.Jose G. ★★★★★ Isabella Alfonso is the dietitian I got assigned to and she has been amazing!Ever since I started the dietary plan she created for me, my relationship with food has improved and I managed to lose 12 kilos in 2 months.I’m really happy with the service I have received (and that I am still receiving) from Dietitian Fit and IsabellaCarmen W.Carmen W. ★★★★★ Working with Kat has been transformative. When I first came to her, I was stuck in a binge-restrict cycle that left me feeling defeated. Although I had a basic understanding of nutrition, I couldn’t break the cycle on my own. Kat brought kindness, warmth, and positivity to every session, developing a plan tailored to my needs and supporting me at every step.Thanks to her approach, I’ve built a much healthier relationship with food and learned countless strategies toward genuine food freedom. Kat made me feel understood and encouraged, lifting my spirits even on days when it felt impossible to be positive. Now, I feel in control of my eating habits in a way I never thought possible. I can’t recommend her highly enough—thank you for everything, Kat!Rosa P.Rosa P. ★★★★★ Marlene has been essential in my journey to understand what I’m eating, losing weight and having a very clear plan for the future. As well as be very patient with my quirks and own ideas on how to achieve my goals. She understood from the beginning how to work with me and I’m very gratefuljason A.jason A. ★★★★★ Alicia Du Preez has been an excellent dietician. It feels like there is a program tailored to suit our needs. We are very hopeful for the future.Paula Mora J.Paula Mora J. ★★★★★ Maia was amazing and I have learned so much from her, including how nutrition is related to gut health, the female cycle, hormones, sleep and stress. I feel so much better mentally and physically after 3 months. My view of food and my body has completely changed and I am really grateful to Maia for being so supportive and providing me with so many useful resources and recipes. I highly recommend working with her!Katie D.Katie D. ★★★★★ Working with Isabella has been brilliant! She is a wealth of knowledge, and I’ve learned so much about nutrition during our sessions. From preparing for a half marathon to crafting a balanced, nutritious (and delicious) diet, she has guided me every step of the way. What I appreciate most is the openness of each session, I could ask her anything, and she always followed up with meticulous notes. I now feel fully equipped to take control of my health and performance, all thanks to her. Beyond her expertise, she’s a genuinely wonderful person and a joy to talk to. Thank you, Isabella!Marella C.Marella C. ★★★★★ Only good things to say !I have worked with Katarina, who's provided me with an easy-to-follow meal plan and various useful tips that really made the difference. Since I started my journey with her I not only feel much better physically, but I have managed to get control of my health and nutrition in the daily routine. She has always been super supportive and available, which allowed me to open up and share a lot with her.Most importantly, Katatina has greatly helped me overcoming my fears of 'trigger' foods, teaching me that no food should be eliminated as long as you are aware of what you are eating to properly nourish your body. Eating out with friends and enjoying weekends drinks has become much easier now!I highly recommend her for your weight loss/health journey 🙂Jennifer R.Jennifer R. ★★★★★ Working with Isabella has been a pleasure. She’s warm, creative and caring and has come up with some fabulous suggestions for meal prepping and organising my time to make sure work days are still good nutrition days. She can take the credit for my return to swimming, pilates and the gym too. With her encouragement and expertise I feel I’m on the path to better health.Ben H.Ben H. ★★★★★ Isabella Alfonso gave wonderful advice and made a great program that was easy to follow.SarahSarah ★★★★★ It has been a lovely experience working with Alicia and so happy to have her with us on our journey. She is very caring and went the extra mile for our toddler which we are so grateful to her for.MartaMarta ★★★★★ I cannot express how grateful I am to have worked with Kat. She is incredibly kind, sweet, and always brings a positive, sunny energy to every session. I came to her in a bad cycle of emotional eating, having gained weight and feeling completely out of control. Although I had a general understanding of nutrition, I simply couldn’t break the cycle on my own. Kat created an effective plan tailored to my needs, and more importantly, she supported me every step of the way, helping me let go of guilt and manage difficult moments.Her approach gave me a new, healthier relationship with food, and I found myself actually looking forward to our sessions, even when I felt shy or guilty about what I had logged in the app. Kat made me feel appreciated and always uplifted my spirits, no matter what. Thanks to her, I’ve reached my goal of losing nearly 5 kg, but even more importantly, I now feel in control of my eating habits. I can’t recommend her enough—Kat is truly the best. Thank you so much, Kat!Ellen M.Ellen M. ★★★★★ I did a programme with Katerina and was so grateful for all her advice and tips! She gave me achievable goals and I use the plan she made me daily. Thank you!Jade B.Jade B. ★★★★★ Alicia was amazing! She was so helpful and understanding. She really helped me understand what our little one needed to deal with his potential allergies and how to approach weening. We have a clear plan moving forward and I will definitely be reaching out again when we are ready to take the next steps!Fabrizio S.Fabrizio S. ★★★★★ I highly recommend Kat as a dietitian. Under her guidance, I successfully lost weight in a few weeks, even while being on holidays. Kat provided tailored, evidence-based advice that was practical and easy to incorporate into my daily routine. Her expertise, combined with her supportive and encouraging approach, made a significant difference in my journey. Kat also taught me to find joy in preparing healthy and balanced meals, transforming my approach to food into something positive and enjoyable. She was always available to answer my questions and offer guidance, ensuring that I stayed motivated and on track. I am truly grateful for her invaluable support and professional insight, which made this process both manageable and rewarding.Elizabeth H.Elizabeth H. ★★★★★ Susan has helped me reset my attitude to food and weight loss. By going back to the basic principles of healthy nutrition and allowing myself to enjoy food, I have been steered away from obsessing about calories and weight loss. I’ve stopped bingeing and shifted my feast or famine mentality to eating what I like without feeling guilty. It’s no longer about fast weight loss for me (followed by faster weight increase) - just healthy habits that I can sustain for life. Susan is so knowledgeable, supportive and passionate about nutrition - she makes it easy for you to change your eating habits!Terence C.Terence C. ★★★★★ An incredible person, really listens to you and provides you with so much information. Consistently checking in, willing to adapt to small things that I required, and such a positive mindset when it comes to dieting and nutrition. Would highly recommend to anyone who is looking to start out their diet journey. ⭐️Lisa T.Lisa T. ★★★★★ Marlene was realistic and set realistic goals. Her clear explanations helped me to manage cravings and understand what I needed to change.jasmine P.jasmine P. ★★★★★ As everyone in the boxing circle is aware, a boxers weight class is a common topic.A couple of years ago I made the decision to move up to the 63kg weight division.I felt fatigued and was injury prone in the 60kg division and almost swore to myself I'd never go back to that weight.However, a few months ago I decided to give it another try.Personally, i wanted to approach it differently this time with a gradual weight decrease starting a few months out to avoid the way I ended up feeling the last time I fought at 60kg.With the Help of Dietician fit and specifically Isabella Alfonso the journey back to 60kg was safe and much less stressful!I have felt fuelled during my intense training weeks and competing. And most importantly to me have felt much happier.Isabella has reassured me during this journey, especially when the human body surprises you (which as a female, it does)!And has been very adaptable to suit my needs. She asks regularly how I feel during training sessions and generally, to ensure I am as comfortable as possible.I won't vow to stay at 60kg forever, but I know whatever weight category I/my body choses, I will be well fuelled and healthy!Claudia B.Claudia B. ★★★★★ I enjoyed my journey with Kat so much! Her advice about intuitive eating was extremely helpful and I have learnt a lot about what my body needs. She is so knowledgable and she has given me a lot of tips that I've managed to implement in my daily life. So happy to have found her and would recommend her highly!Gili B.Gili B. ★★★★★ Kat played an important role in helping me establish a healthier lifestyle during a challenging time when I was moving countries and had no routine. Despite the obstacles, Kat guided me on what to eat, even when I wasn’t cooking at home. Her practical advice and unwavering support made a real difference, and I’m truly grateful for her expertise.Holly G.Holly G. ★★★★★ Katerina helped me so much with my weight gaining journey. I started with very little knowledge of dietary needs and cooking skills, yet Kat made every effort to understand how and where she needed to help me. Her emotional support and attentiveness was incredible, and I will always appreciate the safe space she created for me.Camila R.Camila R. ★★★★★ I consulted Isabella about how to modify my diet to perform in sports. She was very thorough, asked many questions regarding lifestyle and training (times and frequency, intensity, type of training, etc). She designed a meal plan without drastically changing what I usually eat, which made it easy to follow and sustainable. I'm really happy with her assessment and would recommend her to anyone looking to support a better performance in sports with diet. I have noticed I'm no longer lightheaded when lifting heavy weights or after lengthy sessions of rowing in the river. Isabella is also the loveliest person 🙂Amina N.Amina N. ★★☆☆☆ ben S.ben S. ★★★★★ Alicia was so friendly and helpful with our son’s dietary issues, producing a detailed report for us which gave lots of useful insight. Would definitely recommend!Anastasia K.Anastasia K. ★★★★★ I had a brief initial consultation with Karine who introduced me to Maia Lockhart. I then had a meeting with her which I was initially nervous about but it soon turned into a lovely experience. Maia made the effort to record all of my symptoms (PCOS) regarding my cycles, ask me about my lifestyle (work, exercise, stress, sleep), the supplements I take, and my diet overall. She provided me with a lot of information on why her suggestions could be helpful which helped reassure me that I am on the right path. I have been given a flexible meal plan, focussing on variety rather than restriction. There was no requirement to track calories which can be stressful and time consuming. I have also been given a guide towards managing my stress, and advice on how to manage my busy lifestyle. I am extremely satisfied with the amount of support I have received from a single online consultation, and I thoroughly recommend Maia as she was very friendly, compassionate and professional at the same time.Mary Isabel Vieira de R.Mary Isabel Vieira de R. ★★★★★ I want to express my sincere gratitude to Dr. Marlene Ferreira for her exceptional care and professionalism. Her knowledge and dedication have been fundamental in our health improvement process. Thanks to her advice and nutritional plans, she has helped us manage the situation. I highly recommend Dr. Marlene to anyone seeking an expert and committed nutritionist. Thank you so much for everything, doctor!Julia S.Julia S. ★★★★★ I worked with Reema for 6 months and she was a breath of fresh air compared the judgmental nutritionist I'd seen prior. She changed my entire way of eating and my approach toward food. Her kind, empathetic, and helpful way of working was so appreciated.When I first saw Reema, I was working through reclaiming my body after an IVF miscarriage. By changing my eating habits, I was able to conceive naturally and I'm now in the second trimester of my pregnancy. She honestly changed my family's life for the better and I could not be more grateful.Anastasia L.Anastasia L. ★★★★★ I, once again, decided to lose weight not only because I wanted to become fitter but also to avoid becoming a diabetic. My blood tests showed that I was in a pre diabetic stage and losing weight would be very important.I decided this time to ask for professional help from a dietitian rather than embarking on one of the commonly used diets and this is how I met Katerina Ageridou in Dietitian Fit.Katerina understood from our first consultation that I needed to change a few habits that would act as a deterrent in loosing the weight and gave me several tips on how to achieve this change! She also gave me dietary advice to achieve both losing the weight and to avoid diabetes. She demonstrated that she can pair her extensive knowledge on nutrition with the individual needs of her clients helping them to achieve their goal!I found Katerina’s help during our consultations invaluable because her advice for a start motivated me to start the journey of losing weight but it will also help in the long run to reach my target weight and to maintain it. Hopefully this effort will also result in avoiding diabetes.Katerina I can’t thank you enough !js_loader

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A passionate team of HCPC-registered dietitians with expertise in weight management, gut health, diabetes and more.

“We take the time to understand your body, lifestyle and mindset – and help you make changes that last.”

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Average results of our clients in 3 months

9 kg
Weight loss

5 cm
Decreased

Waist circumference

50 %
Improved

Energy level

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