
Authored on 11 May 2026 by Dr Ruch Karunadasa,
Medically reviewed 11 May 2026 by Mr Adeel Arshad.
Next review due: 11 May 2027
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How to diet effectively
Giving your body the fuel it needs for weight loss.Struggling to choose a diet? Looking for a diet that actually works? With 1000s of diet plans out there, how do you know which one to trust, or which will work in the long run?
At PrivateDoc we believe in creating healthy habits which are sustainable in the long run. You won't find any juice cleanses or weight loss coffees here, the advice we offer is designed to give your body the nutrients it needs, whilst maintaining a healthy calorie deficit for lasting and sustainable weight loss.
Here are our top guidance tips:
Don't be too restrictive
When starting a weight loss journey, many people think the fewer calories they consume the better, however, this is not going to get you lasting sustainable results and your weight is likely to yoyo. When reducing calories it’s always good to use a calculator to work out your BMR (Base Metabolic Rate) and TDEE (Total Daily Energy Expenditure). Your BMR is how many calories your body burns at rest, just through bodily functions and keeping you alive. Your TDEE includes activity levels, weight, height and age to give an approximate calculation of calories burnt in total. Usually, when calculating calories you look to drop calories from your TDEE, making sure that they stay above your BMR.
Using averages we’ve developed a weight loss diet plan which contains calorie-controlled and nutrient-dense meals which you can purchase here following this link: PrivateDoc Diet Guide.
Understand good quality food sources & macronutrients
All foods are made up of macro-nutrients, commonly referred to as macros. Our 3 main sources are carbs, protein and fats. When dieting it's important to find a healthy balance of all 3 and also the quality of those food sources; for example opting for unprocessed carbohydrates such as potatoes over processed carbohydrates such as pizza.
Don't skip meals or drop calories dramatically
It might feel like a good idea to save calories here and there by skipping meals or even dramatically reducing calories to fast track results; however, these quick-fix diets are most likely to rebound as they are unsustainable in the long run. Skipping meals can also cause you to binge later as hunger hormones rise.
Keep consistent
Another way to diet effectively sounds obvious - but is often overlooked - consistency. If you're restricting calories, eating healthier and exercising more consistently alongside your weight loss treatment, you will see results. Whilst there will always be odd days where you eat slightly more, or even slightly less, typically if you follow the 80:20 rule, you'll achieve lasting results. Acknowledging that 20% of the time you may slip up, also allows your diet to be more sustainable as a lifestyle choice, so you can still celebrate special occasions etc and then jump back on track.
Get your nutrients through diet or supplementation
When restricting calories it can be more difficult to get a healthy range of vitamins and minerals into your diet. Supplements help bridge the gap when we are unable to get the nutrients we need from our diet alone, they can help maintain and even have potential to improve our health. To find out more visit our weight loss supplement support.
Track your calories
To lose weight you need to be in a calorie deficit, which means you need to burn more calories than you consume. A good diet plan should keep your calories in check to ensure you're on track for weight loss, without dramatically dropping calories lower than necessary. We recommend following our diet plan for guidance which you can purchase here.
Or if you would like to go it alone, we recommend using a calorie tracking app such as Myfitnesspal which will enable you to ensure you're consuming the right amount of calories, but also macro and micro nutrients such as carbs, protein, fats & minerals.
Avoid starvation mode
It can be tempting when starting a weight loss treatment to drop your calories as low as possible in an attempt to see faster results. We see this with a lot of our patients, however this is not advised as it is not a healthy approach to weight loss, nor is it sustainable in the long run.
Starvation mode is typically what we refer to as metabolic damage, where calories have been restricted for so long the body's natural response is to attempt to use less calories expenditure to avoid starvation mode. Over time, this means your BMR decreases and it becomes harder and harder to lose weight. The technical term for this physiological response is “adaptive thermogenesis”. In order to avoid this try not to decrease calories too low & also gradually increase calories when your target weight is achieved. This is referred to as reverse dieting.
The PrivateDoc Sirtfood Diet Guide
If you'd like further dietary advice from us, why not try the PrivateDoc Sirtfood diet guide.
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Clinical authorship and medical review
This treatment information is written by a registered clinician and medically reviewed by a registered clinician or pharmacist. Follow the links below for professional profiles.
Written by: Dr Ruch Karunadasa
Authored on: 11 May 2026
Medically reviewed by: Mr Adeel Arshad
Medically reviewed on: 11 May 2026
Next review due: 11 May 2027
Clinical standards
Our clinical content is based on primary medical sources including the NHS and the Electronic Medicines Compendium (SmPC). Learn more in our guide to about our medical content and our editorial standards.