Top 10 diets review

With so many diet options to choose from it can be hard to find a weight loss plan that’s right for you.

To help, the British Dietetic Association (BDA) looks at the pros and cons and gives its verdict on the 10 most searched-for commercial diets.

The 5:2 diet

The 5:2 diet is currently one of the most searched-for diets on the internet. The 5:2 diet is based on a principle known as intermittent fasting (IF) – where you eat normally five days a week and fast on the other two days. But is it safe? Read our review of the evidence in 'Does the 5:2 intermittent fasting diet work?'.

Dukan diet

The Dukan diet is a low-carbohydrate (carb), high-protein diet. There’s no limit to how much you can eat during the plan’s four phases, providing you stick to the rules of the plan. During phase one, you’re on a strict lean protein diet. This is based on a list of 72 reasonably low-fat protein-rich foods, such as chicken, turkey, eggs, fish and fat-free dairy. This is for an average of five days to achieve quick weight loss. Carbs are off limits except for a small amount of oat bran. Unlike the Atkins diet, Dukan’s phase one bans vegetables and seriously restricts fat. The next three phases of the plan see the gradual introduction of some fruit, veg and carbs and eventually all foods. The aim is gradual weight loss of up to 2lb a week and to promote long-term weight management. There’s no time limit to the final phase, which involves having a protein-only day once a week and taking regular exercise.

You can lose weight very quickly, which can be motivating. It’s a very strict and prescriptive diet and some people like that. It’s easy to follow. You don’t need to weigh food or count calories. Apart from keeping to low-fat, low-salt and high-protein foods, there’s no restriction on how much you can eat during your first two weeks.

At the start of the diet you may experience side effects such as bad breath, a dry mouth, tiredness, dizziness, insomnia and nausea from cutting out carbs. The lack of wholegrains, fruit and veg in the early stages of the diet could cause problems such as constipation.

BDA verdict:
Rapid weight loss can be motivating but it is unsustainable and unhealthy. The Dukan diet isn’t nutritionally balanced, which is acknowledged by the fact that you need a vitamin supplement and a fibre top up in the form of oat bran. There’s a danger this type of diet could increase your risk of long-term health problems if you don’t stick to the rules. The diet lacks variety in the initial phases so there’s a risk you’ll get bored quickly and give up.

Many of the diets listed here are quick fixes and may not be sustainable or healthy in the long term. They could make your weight more likely to fluctuate or ‘yo-yo’.

Find out how to lose weight the healthy way with our 12-week weight loss plan.

Atkins diet

The Atkins diet is a low-carb, high-protein weight loss programme. You start with a low-carb diet designed for rapid weight loss. This lasts at least two weeks depending on your weight loss goal. During this phase, you’re on a protein, fat and very low-carb diet, including meat, seafood, eggs, cheese, some veg, butter and oils. In contrast to the Dukan diet, Atkins allows unlimited fat and some veg, such as peppers, cucumber and iceberg lettuce, during phase one. During the next three phases, the weight loss is likely to be more gradual, and regular exercise is encouraged. More carbs, fruit and veg are introduced to your diet with the aim of working out what your ideal carb intake is to maintain a healthy weight for life. Phase one is designed to help you lose up to 15lb in two weeks, reducing to 2lb to 3lb during phase two.

You can lose weight very quickly, which can be motivating. The diet also encourages people to cut out most processed carbs and alcohol. With its diet of red meat, butter, cream, cheese and mayonnaise, it’s one of the few diets out there that appeals to men. 

Initial side effects can include bad breath, a dry mouth, tiredness, dizziness, insomnia, nausea and constipation from cutting out carbs and fibre. The high intake of saturated fat may increase your risk of heart disease and there are concerns that a lack of fruit, veg and dairy products and a high protein intake may affect bone and kidney health in the long term.

BDA verdict:
Rapid weight loss can be motivating but it is unsustainable. The Atkins diet isn’t nutritionally balanced. By limiting fruit and veg it contradicts all the advice on healthy eating that we have tried so hard to pass on to people. The meal choices are limited so there’s a risk many people will get bored quickly and drop out or take a ‘pick and mix’ approach.

Cambridge diet

The Cambridge Weight Plans are based around buying and eating a range of meal-replacement products with the promise of rapid weight loss. There are six flexible diet plans ranging from 415kcal to 1,500kcal or more a day, depending on your weight loss goal. There is also a long-term weight management programme. The bars, soups, porridges and shakes can be used as your sole source of nutrition or together with low-calorie regular meals. While on the programme, you receive advice and support on healthy eating and exercise from a Cambridge adviser.

Many people on very low-calorie diets (VLCDs) find the weight loss to be sudden and quite dramatic. The meal replacements are all nutritionally balanced so you're likely to be getting all the vitamins and minerals you need albeit not from real food.

Initial side effects can include bad breath, a dry mouth, tiredness, dizziness, insomnia, nausea and constipation from cutting down on carbs and fibre. The hardest part of the plan is sticking to it. Giving up normal meals and swapping them for a snack bar or a shake can be boring and feel socially isolating. This isn’t a plan you can stick to in the long term.

BDA verdict:
You need to like the meal-replacement products to stay with the plan. Rapid weight loss can be motivating but it is unsustainable. A VLCD that involves eating 1,000 calories a day or fewer should not be followed for more than 12 continuous weeks. If you are eating fewer than 600 calories a day, you should have medical supervision.

South Beach Diet

The South Beach Diet is a low-GI diet originally developed for heart patients in the US. There’s no calorie counting and no limits on portions. You're encouraged to eat three meals and two snacks a day and follow an exercise plan. People who have more than 10lb to lose start with phase one. This is a two-week quick weight loss regime where you eat lean protein, including meat, fish and poultry, as well as some low-GI vegetables and unsaturated fats. Low-GI carbs are re-introduced during phases two and three, which encourage gradual and sustainable weight loss.

If you can avoid phase one and start on phase two, there are fewer dietary restrictions in the rest of the plan than some other popular diets. After phase one, the diet broadly follows the basic principles of healthy eating. No major food groups are eliminated and plenty of fruit, veg and low-GI carbs are recommended.

The severe dietary restrictions of phase one may leave you feeling weak and missing out on some vitamins, minerals and fibre. You may initially experience side effects such as bad breath, a dry mouth, tiredness, dizziness, insomnia, nausea and constipation.

BDA verdict:
The first two weeks are the most difficult to get through. We’re concerned that this diet promises such a large weight loss, up to 13lb, in the first two weeks. This, though, won't be all fat. Some of the weight loss will include water and carbs - both of which will be replaced when you begin eating more normally. Once you get past the initial phase, the diet follows the basic principles of healthy eating and should provide the nutrients you need to stay healthy.

Slimming World diet

Slimming World’s weight loss plan encourages you to swap high-fat foods for low-fat foods that are naturally filling. You choose your food from a list of low-fat foods they call 'Free Foods', such as fruit, vegetables, pasta, potatoes, rice, lean meat, fish and eggs, which you can eat in unlimited amounts. There’s no calorie counting, no foods are banned and you’re still allowed the occasional treat. You can get support from fellow slimmers at weekly group meetings and follow an exercise plan to become gradually more active. The plan is designed to help you lose about 1lb to 2lb a week.

No foods are banned so meals offer balance and variety and are family-friendly. The portion size from each food group will vary depending which plan you follow. The 'Body Magic' booklet they provide gives ideas to help you raise your activity levels. Meeting as a group can provide valuable support.

Slimming World doesn’t educate you about calories. Without having learned about calories and portion sizes, you may struggle to keep the weight off in the long term when you come off the programme.

BDA verdict:
The group meetings encourage members to share successes, ideas and recipes with each other but they may not appeal to everyone. While the meal plans may lack some flexibility, they are generally balanced. However, without learning about calories and portion sizes, you may struggle to make healthy choices once you’ve left the programme.

Slim-Fast diet

The Slim-Fast diet is a low-calorie meal replacement plan for people with a BMI of 25 and over. It uses Slim-Fast’s range of products. The plan recommends three snacks a day from an extensive list, including crisps and chocolate, two meal replacement shakes or bars and one regular meal, taken from a list of recipes on the Slim-Fast website. You can stay on the diet for as long as you want depending on your weight loss goal. Once reached, you’re advised to have one meal replacement shake a day, up to two low-fat snacks and two healthy meals. The plan is designed to help you lose about 1lb to 2lb a week and you can follow the diet for as long as you want.

Meal-replacement diets can be effective at helping some people to lose weight and keep it off. The plan is convenient as the products take the guesswork out of portion control and calorie counting. No foods are forbidden although you are encouraged to eat lean protein, fruit and vegetables.

On their own, meal-replacement diets do little to educate people about their eating habits and change their behaviour. There’s a risk of putting the weight back on again once you stop using the products. You may find it hard to get your 5 a day of fruit and veg without careful planning.

BDA verdict:
If you don’t like the taste of the meal replacement products, you won't stay with the plan. The Slim-Fast plan can be useful to kickstart your weight loss regime, but it’s important that you make full use of the online support to learn about the principles of healthy eating and how to manage everyday food and drink.

LighterLife diet

The LighterLife weight loss plans combine a very low-calorie meal-replacement diet with weekly counselling. With LighterLife Total, for people with a BMI of 30 or more, you eat four 'food packs' a day, consisting of shakes, soups, mousses or bars, and no conventional food. LighterLife Lite, for those with a BMI of 25-30, involves eating three food packs a day plus one meal from a list of approved foods. You stay on the plans until you reach your target weight. The meal plans can lead to very rapid weight loss and you’re advised to see your GP before starting. How long you stay on the diet depends on how much weight you have to lose.

The counselling can help you understand your relationship with food, so hopefully you can make lasting changes to keep the weight off for good. With the meal replacements, there’s no weighing or measuring, so it’s a hassle-free approach to weight loss.

Initial side effects of the diet can include bad breath, a dry mouth, tiredness, dizziness, insomnia, nausea and constipation from cutting down on carbs and fibre. Surviving on a strict diet of shakes and soups and other meal replacements isn’t much fun and can feel socially isolating.

BDA verdict:
Rapid weight loss can be motivating but it is unsustainable. LighterLife’s VLCD and its counselling component may work for some, particularly people who have struggled to lose weight for years, have health problems as a result of their weight and are clinically obese with a BMI of more than 30. A VLCD that involves eating 1,000 calories a day or fewer should not be followed for more than 12 continuous weeks. If you are eating fewer than 600 calories a day, you should have medical supervision.

WeightWatchers diet

The WeightWatchers plan is based on the ProPoints system, which gives a value to foods and drink based on protein, carbs, fat and fibre content. It is essentially a calorie-controlled diet where you get a personal daily ProPoints allowance, which you can use how you like. There’s no limit on the amount of fruit and most veg you can eat. You also get a weekly ProPoints safety net in case you go over your allowance, and an individual exercise plan. The weekly meetings and confidential weigh-ins provide support and extra motivation to encourage long-term behaviour change. The plan is designed to help you lose up to 2lb a week.

No foods are banned so you can eat and drink what you want providing you stick to your points allowance. The ProPoints system is easier to follow for some than calorie-counting and less restrictive than other plans. This is because it introduces a safety net of points, which can be saved up for a special occasion, such as a night out, a small amount of alcohol or treats.

When you begin, working out the points system can be just as time consuming as simply counting calories. Some people feel pressured into purchasing WeightWatchers branded foods.

BDA verdict:
The ProPoints plan is generally well balanced and can be a foundation for long-term changes in dietary habits. The support group approach can help keep people motivated and educate them about healthy eating. But it’s vital that you make the connection between the points system and calories if you want to avoid putting the weight back on once you leave the programme.

Rosemary Conley diet

Rosemary Conley’s Diet and Fitness plans combine a low-fat, low-GI diet with regular exercise. You can follow her recipes or buy from her range of calorie-controlled ready meals and snacks. You’re encouraged to eat food with 5% or less fat, with the exception of oily fish, porridge oats and lean meat. A network of local Rosemary Conley clubs offers weekly exercise classes, support and motivation. You learn about calorie counting and portion size, which can help you sustain your weight loss beyond the programme. The diet is designed to help you lose a stone in seven weeks. How long you stay on the plan depends on your weight loss goal. 

The programme is based around calories, with a focus on cutting fat. The 'portion pots', which are used to measure foods such as rice, cereal, pasta and baked beans, teach you about portion control. Physical activity is an integral part of the weight loss plan, with exercise sessions suitable for all ages, sizes and abilities offered at their weekly classes with trained leaders.

Some low-fat products aren't necessarily more healthy because they can still be high in sugar and calories. It is unrealistic to expect people to go out with their portion pots and, therefore, portion control may be more tricky away from the home.

BDA verdict:
The diet and exercise plans offer a balanced approach to weight loss that teaches you about portion size, the importance of regular exercise for weight management and making healthier choices. The educational element is very useful for long-term weight management once you have left the programme.

Jenny Craig diet

The Jenny Craig programme has three main features: one-to-one support, a meal delivery service and tailored exercise plans. The weekly, personalised telephone consultations provide advice, motivation and support. The diet adviser assesses your reasons for gaining weight and, over the course of the programme, helps you to change your behaviour. The meals and snacks are packed into single-sized portions to suit your weight-loss needs. You need to add certain fresh fruits, veg and low-fat dairy products. The programme is designed to help you lose between 1lb and 2lb a week until you reach your target weight.

All the meals, including snacks, are calorie-counted, portion-controlled and delivered to your door. You eat real food, receive telephone support and learn about portion size, calories and exercise, which can all help you make healthier choices beyond the programme.

The meals don’t contain fruit, veg or dairy, which will be an additional expense. This isn’t an approach that you can stick to in the long term so it’s vital to learn how to prepare or choose healthy food yourself rather than relying on someone else.

BDA verdict:
If you don’t like the Jenny Craig meals then this diet won’t work for you. If you want a diet where most of the work is done for you then the Jenny Craig programme can be a good solution. The concern with pre-packaged meals is whether dieters will realise there is no magic trick and be able to replicate the meals, with the same portion sizes and calories, once they are on their own.

Last reviewed: 20/12/2011

Next review due: 20/12/2013


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brighton21 said on 12 April 2013

Dieting is unhealthy and most of the time does not work!!! I ended up in hospital repeatedly as a result of dieting because I suffered from tachycardia due to the rapid weight loss. The best thing to do is to be healthy and that means a balanced diet and exercise. If you go for a jog/run every other day and do home work outs eg. pilates, stretching and weights (if you have them) every day then you get fit and toned. Cycling is particularly good as it doesn't strain knees etc as much as running, is a good form of transport and is suitable for most age groups. If you need to lose a significant amount of weight then couple exercise with a cut down on fatty foods, portion control use and eat 3 balanced meals a day. Set diets like the atkins etc are not healthy and can do more long-term damage to your body than good. Why do you need to eat that much protein unless you are a body builder? Diets like that result in malnutrition. Sustainability is the key to weight loss- there is no point rushing and losing weight rapidly if you end up fatter in the long run. Losing weight in a healthy way is not easy but is worth it because not only does it last but it also better for your beauty- it makes your hair, skin and body look healthy and youthful, whereas when dieting you look pallid, you get loose skin and most importantly you lack energy and are grouchy.

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Matthew Erskine said on 21 March 2013

I disagree with your negative comments about Slimming World. You say that you don't learn about calories, but that is only a means to an end, the end being having enough information to decide what to eat and drink and in what quantities, frequencies etc. I have all of that information without needing numbers of calories. My meals are varied and I know exactly what I need to do to lose weight slowly and steadily and, crucially, what to do when I have reached my ideal weight. I have lost three and a half stones in six months, I have another stone to go, and I'm enjoying losing the weight and getting fitter and healthier.

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Harvz said on 06 March 2013

Reduced sugar diet:
I have found reducing sugar and keeping carbs to a minimum to be a very effective and healthy weight loss option. In just three months, I have shed 13 Kilograms and now have no trouble maintaining what I eat.
What I have also found great about this method is that exercise has not been part of my weight loss at all.

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aby385 said on 10 February 2013

i lost lot of weight by just walking for half an hour 5 time a week after dropping my kids of at school but now finding it hard to maintain my weight as my kids go to secondary school and travel on their own and i hate walking alone

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Skyrim said on 26 January 2013

Well I've tried Rosemary Conley and found it far too strict. I was always hungry. Then I tried Slimming World because everyone raved about and I put weight on. So in the end I joined Weight Watchers. Brilliant!! It's wonderful and it's so easy I don't know why I didn't try it before. Their pro points system is just the best. I never feel hungry. I'm so motivated now and I'm losing weight. Plus it's easy to maintain your weight once you've lost. Best diet ever.

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Gina Giraffe said on 10 January 2013

Very impressed by these reviews of the various diets.

Can I put in a good word for Weightwatchers? They helped me lose almost 2 stone in 7 months. I feel much better - and more importantly I've managed to maintain the weight loss for 8 months so far. They must have reeducated me! Although they count points rather than calories, they always encourage portion control and you soon learn which foods to avoid.
They also have a programme where you don't need to count, as long as you stick to the right foods.
I stopped going to meetings and paying my subscription when I was still 3 pounds short of my goal weight. I had the idea that if I hadn't quite got there I wouldn't, perhaps, become complacent.
The one downside is that since I stopped paying I have been bombarded with emails and text messages urging me to return. I expect they mean well and I might need to return in the future!

Hope writing this doesn't bring me bad luck!

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katie1989 said on 09 January 2013

the best diet you can go on is calorie counting , eat plenty of fruit and veg and exercise as much as you can , I lost 5stone in under a year eating 1200 calories a day , I wouldn't waste my money on these diet plans and clubs .

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Greedy girl said on 09 January 2013

After being morbidly obese for many years having tried Rosemary Conley, slimming world, weight watchers etc I tried Lighter life, what really worked for me was not the low fat, points etc, it was the small groups and exploring the reasons of why (not hunger) we over eat. The people who have re gained their weight did obviously not follow the management plan, once you have done that you can continue going to groups for life, the counselling side to Lighter Life is as important as the soups, shakes, bars, it's the head that hunger comes from not the stomach, myself and many members have kept their weight off for many years, I appreciate if you only have a small amount to lose then this is probably not for you, but if the only alternative is gastric banding then give this a go!

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BetsyCameron said on 09 November 2012

In my book by far and away the best diet I have ever tried is slimming world's. I admire people who can stick to this diet because you do lose weight on it but if you fall of the wagon and go back to your old eating habits (easy to do) you put all the weight back on again. If you can stick to a diet then slimming world is the way to go. It is not really a diet but more of an eating regime where my plate was stacked with certain types of food. I never felt hungry on this but you have to follow it down to the last detail. Since falling off the slimming world wagon a friend of mine convinced me to try supplements by innoveat and I have been losing weight very nicely thank you. I have lost weight at about the same rate as slimming world but I love the freedom these supplements give me with regards to what I do and don't eat. I actually feel like I want to eat healthier wholesome food now not sugary snacks and junk food. I feel grrreat!!! :)

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xxxxstephxxxx said on 27 September 2012

I joined Slimming World 3 years ago and in 6 months I lost 2.5 stones and got to my target of 9.5 stone. I love my food and so thoroughly enjoy doing the Slimming World plan.......I never go hungry and it has re educated me to choose low fat and low sugar foods. I cook healthy meals that the whole family enjoys and my husband has lost 3 stones without even realising he was doing the plan!! My children also eat everything that I eat so they are healthy too. Slimming World is not a faddy diet it is just healthy eating and I would recommend it to everyone! I have maintained my weight loss and I still go to my group every week as I enjoy the group and we have a good laugh! I think you need to go to a group though as this is where you learn recipes and share ideas..

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GinnyGinny said on 03 September 2012

Thanks for summing up some of the most recent diets.
I have gone though lots of diets in my life but haven't managed to get and hold the weight I wanted to.
Then I started with the Dukan Diet (in March 2012) and lost about 4 1/2 stone with it. I'm still in phase 2 though I nearly reached my goal of about 9 1/2 stones.
As for me I need restrictions so this diet was/is perfect for me. The initial Phase just takes about a week and is managable. Phase 2 is for the actual weight loss and I'm loosing about 1-2 pounds a week. I'm not bored eating from the resticted list of food but sometimes I'm craving for a slice of bread or a biscuit (but never gave in). As my husband works abroad it is kind of easy for me to cook my own meals without carbs and low fat.
In Phase 3 the carbs are coming back slowly and you are trying to hold your weight for 10 days each kilogramm you lost (that would be about 280 days for me).
After that you should be used to a much more healthier way of living and eating (which after approximately one year it really should work out!) and you only need to do one protein day a week (which isn't too bad at all, really!).
There are some Dukan Diet products online available to help with your diet (like oat bran flakes, flavourings, oat bran biscuits, ...).
I don't like to go to meetings and support groups so this diet is the best option for me.

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Healthsummaries said on 26 July 2012

Thank you for your valuable information regarding diets . I am using this and other information to provide quick summaries of diets at out health/diet section at

Much appreciated.

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AliceBlueGown said on 13 July 2012

I lost four stones with Slimming World, the first two on a postal membership (which is no longer offered) and the second two by going to meetings. I was lovely and slim when I went for bowel surgery last year, and my surgeon was certainly happy, as it made his job much easier. Since then, I have struggled to get my weight under control, and last January I gave up SW for several months as I was getting discouraged. I have just had a yearly check-up with the Colorectal nurse at the hospital (following a CT scan) and everything is OK. I asked whether the feelings of hunger I get were due to the surgery. She suggested that I cut caffeine and try to drink more water. I have only been doing this for a couple of days, but I'm definitely feeling better, and not so hungry. Basically, because the bowel is where water from food is absorbed, someone who has lost 2/3 of the large bowel, as I have, needs to drink more to make up for the lack of absorption. I have been puzzling about this for some time, and I am putting this comment on here in case it is helpful to someone else with the same problem. Even for someone who hasn't had surgery, thirst can masquerade as hunger, so it is important to remember to drink enough water. I believe I will now get on much better with losing weight!

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raspberryjamandtoast1 said on 23 May 2012

I tried Slimming World for two years and it didn't work for me at all. I am vegetarian and this may be part of the reason, but I found myself craving bread (which is very restricted on the Slimming World diet). I also wanted things that are in fact healthy like nuts and avocado. In general, I don't think it's a very sustainable plan- maybe for a few people but judging buy the number of 'returners' there were at my group, I would say it's not that amazing. Even the leader had failed to maintain her weight loss and was on the verge of morbid obesity- not a very good advertisment.
It is worth bearing in mind that something like 98% of people regain the weight lost when dieting - plus more, usually.
I don't diet AT ALL now, and instead am learning intuitive eating - really learning to understand hunger and satiety and the reasons I have overeaten in the past.

This is a long term process and not a quick fix, but I have never felt so normal around food. I have been researching and reading about this for a long time and for me, and many others, it has been a godsend. I am losing weight now, but I don't know how much as I have thrown my scales away. They just cause upset and half the time small weight gains and losses are due to other factors (including inaccurate scales, water retention, dehydration etc ). I have used many books and websites on Intuitive Eating, and joined 'Beyond Chocolate'.

I eat a completely balanced diet now and yes, this does include chocolate and cake when I want it. And I never binge- this is entirely due to learning when to stop eating. No commercial diet plans can teach you this, although some of them claim to. Weight loss is not what you are aiming for- gaining control of overeating needs to be the goal. And there is no such thing a 'bad' food- unless you eat too much of it.

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Mick G 62 said on 13 April 2012

I've lost over 6 stones with Slimming World and now have a lifestyle that I can maintain for the rest of my life. You may not count calories on Slimming world but you control them through being educated to chose the right foods and right balance of foods with every meal. You can not count calories for the rest of your life and the beuty of Slimming World is it's simplicity meaning you can maintain it for life.

Through attending the groups I have so much about what foods are good for me and what foods are not so good. The amount of ideas and recipes that you gain is staggering.

Having taken statins for 7 years I now no longer need them, saving me the monthly prescription charge and also benefitting the NHS financially. Some NHS trusts run the Slimming World on referall scheme which although a small intial cost can lead to huge savings for both the NHS and the individuals concerned.

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