Slimming World
Slimming World is a long-established UK company which operates a very successful weight-loss program as a weekly class for members, based on its diet plan “Food Optimising”. (NOTE: All trade marks mentioned in this article are the property of the registered proprietor).
Food Optimising Diet
The Slimming World Food Optimising Diet promotes weight-loss through calorie restriction in the diet. Members are encouraged to be active, but exercise is not a formal part of the Slimming World plan. The diet is based on these principles:
- Nutritious or filling foods having a low calorie content are termed “free foods” (that is, the quantity consumed is unrestricted).
- Higher-calorie foods containing plenty of minerals, vitamins or fiber are termed “healthy extras”, and are recommended to be eaten in 4 small servings daily.
- Other foods are measured against a daily allowance based on their “syn values” (coined by Slimming World and short for synergy SYN is actually a re-working of the registered trademark SIN). A total of between 5-15 syns per day is permitted, depending on your goals – 1 glass of wine comes in at 5 syns. Syn values for individual foods are calculated by a proprietary method based on calories, and the values for thousands of foods can be checked on the Slimmers World website by members of the program.
Red Days and Green Days
Each day of the weekly diet under the Food Optimising plan is termed an Original (or Red) day or a Green day. Foods may be classified differently depending on which day they are to be consumed.
- Red day “free foods” include most fruits and vegetables, white fish, lean meats and eggs. Milk, cheese, bread, grains, beans, potatoes and dried fruits are restricted “healthy extras”.
- Green day “free foods” include fruit and vegetables, grains, beans, pulses, pasta, rice, tofu, and eggs. “Healthy extras” include milk, cheese, bread, dried fruit, nuts and seeds, meat, and fish.
Participants choose either the Green or Original (Red) option for the day and stick to it all day. With either option, members can eat plenty of healthy, highly satisfying foods, while the intake of energy dense, fatty and sugary foods is controlled.
The recent addition of two further choices, Mix2Max and Success Express, gives more flexibility to the Food Optimising diet plan, and more options for slimmers.
- Mix2Max gives flexibility by allowing a mix of Green and Original the same day, choosing at each meal time instead of each day, and still allowing snacking through the day from a long list of foods.
- Success Express gives participants a super boost to their weight loss when needed, by allowing Green and Original Free Food on the same plate, without counting. One third of the plate is filled by free choice from Green or Original Free Food lists. The other two thirds is filled with so-called Superfree Foods (super healthy, super low in energy-density) such as vegetables and salad. There is still a long list of foods that can be snacked on throughout the day.
Sample Meal Plan
| Breakfast 1oz muesli and fat free vanilla yoghurt. Snack Lunch Dinner Syns: 0 |
Healthy extras
227g baked apple with 1tbs mincemeat, and 7 high fiber crackerbreads.
Main meal
On a Green day – Spicy chicken and spinach with pasta and a green salad.
- Stir fry in a wok, about 120g chicken, marinated in (fat-free) yoghurt and curry paste (2 syns) .
- Add spinach until wilted.
- Add steamed green beans.
- Add cooked pasta and half a small pot of fat-free natural yoghurt.
Sample Alternatives:
On a Green day, for a tasty and very filling spaghetti bolognese use a measured serving of lean mince in tomato sauce with plenty of pasta.
On an Original day, for a very satisfying lunch have a jacket potato, mounded with low-fat chicken curry.
Find more healthy low Calorie recipes here.

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I would like to try the green day/red day diet. It sounds simple and at age 77 – 5ft 2″ and 13st 5lb I really need to lose weight
I’ve just started slimming world and still a bit confused. Can you eat pasta/noodles between meals also or must they be restricted to your lunch or dinner? any help would be appreciated
Please can you let me know where and when the lunchtime meeting is for Hyde Tameside
Thank you
I have been in the USA for 11 yrs and never thought of looking on line for slimming world??? Lol I lost 38lbs with slimming world UK in Manchester after the birth of my child. Yes!!!! I’m back!!! I can get back to the way I used to feel… Healthy fit and most of all satisfied! Iv tried every diet going but slimming world has been the only one that ever worked and I kept it off for about 8yrs. Unfortunately iv slipped and need to come back. Thank u for this site where I can re-fresh my dimming memory.
Hi, do you have a sliming world in Spain ? alicante ?
right my mam has ate nothink but salads all week and put weight on i have done nothink but eat rubbish all week n lost can anyone tell me how it works
Hi,
I am just wondering if there is slimmer’s world club over here in N.Z
I have just started SW an i havent a clue at the mo what i’m doing, i could do with a 7 day plan to go off lol, as really confused at the mo!
Its not for everyone but nothing is. It works for me I have been on it for a couple of years lost the weight and am now keeping it off.
Its a program for life though really but the great thing is that if you stick to it you are basically eating healthy not just being on a diet. So as well as being thiner I am sleeping better, have more energy etc…
There is a website for Slimming World followers in Spain. There are no classes in Spain but you can get recipes and support on the website. http://www.slimmingworldspain.com
Joined slimmingg world four weeks ago found weight loss quite slow 1lb a week and one week lost 21/2lbs total loss 41/2lbs
What syn value are plain red skinned peanuts?
Hi, I have joined slimming world in the uk and am really enjoying it, it really doesn’t feel like a diet but I am losing weight. My mum lives in South Africa and she wants to join Slimming World too. Do you operate there? Is there an option for me to buy the books here for her otherwise?
Thank you
how much dose it cost weekly for the group meatings ?
Would like a weekly routine of green and red days
Hi
I would like to start the red and green day eating plan. Please could you tell me where I can buy the 2 books showing all you can eat in each with the sins.
how do I get started
HELP. I LIVE IN THE U.S. HOW MUCH DOES IT COST FOR THE PROGRAM IN AMERICAN MONEY? I WOULD LIKE TO JOIN ONLINE.
http://www.slimmingworldusa.com/
Hello!
Are bananas low calories food? therefore are allowed to eat for slimming world diet? Is there some good list of “free foods” ?
thank you for your help!
just bought Woman’s World,same as woman’s weekly uk,
and diet was in it,I have been on it three day’s,and I am down 3lbs,you.GOING FOR 15.
Thank
it is a good website
hey there. i am looking for a slimming world group in somerset west south africa. is there one? i did a few classes in the uk but have relocated and so need to toss the pounds.
what u at how are u how are u keeping how are u getting on
Where is my nearest Slimming World class and on what days where? I live in Northampton.
Thank you
hi karen i can help you out if thats any help (0:
Holy @#$% this is the first “diet” (that actually isn’t one) that has ever worked for me. I quite literally eat ALL DAY. I suspect Lesley either isn’t eating enough or is fudging on the syns/healthy extra measurements. A lady in our group has lost 100 pounds, I lost 32 in 9 weeks. The big thing here is that you can quite literally eat ALL the food you want (including potatoes, dried pasta, rice and lean meats) and lose weight doing it. It’s completely counter-intuitive to everything I’ve been raised hearing; however the proof is in the three pants sizes I’ve gone down in a SHORT period of time! The biggest epiphany I had was that food isn’t the enemy — it’s the WAY we prepare it that is what’s making us all fat. All those little condiments are killers, as are the junky breads and the creepy fillers that restaurants and pre-packaged food makers use to make their foods taste so ‘good’.
The coolest thing is that I cheat every now-and-again, eating a slice of cheesecake or big order of fries or ball park nachos… and can still lose weight that week. THAT my friends is a plan I can do for the rest of my life without feeling deprived!
Gotta admit… I’m still pretty ticked at the diet industry for making it WAY more complicated than it has to be. It makes me question their motives.
To Karen in NZ,
You can get it on-line from Slimming World website. You may need to rejoin as an on line member in order to have a regular access, but it’s a small price to pay if you believe in it; I do.
Hi there I wonder if anyone knows how to go about getting a copy of the red / green diet lists. Im in NZ and so regret not bringing one out from UK, Only diet that has made me feel like I wasnt on a diet!! Any help gratefully received. Feeling frumpy and my jeans dont fit HELP!!
SW is fantastic. I was a member over 10 years ago and have maintained my weight since reaching my Target. I have been living in Aus for 8.5 years and have found it quite easy to follow the plan even though it has been difficult to obtain certain items like Quorn (which is now available), plain fromage frais, Creme Fraiche (either low fat or otherwise), Quark (though this is creeping in)and Chicken Bovril! But hey it’s the quality of life and moderation in all things! Have incidentally put several people on the SW path as I have kept my magazines and book which I updated last time in UK. All’s good!
Fiond extra easy plan too confusing, prefer to stick to red/green days