Weight Loss FAQs and Tips


What is 3·2·1? How quickly can I see the results? If you have questions about Slim·Fast®, or around weight loss, diet or nutrition, check our frequently asked questions here. Then if you’re still left wondering, put your query to our nutritionist Fiona here. She’ll get back to you with a response that’s tailored to you.


What is the Slim·Fast 3·2·1 Plan?

Slim·Fast is formally known as a 'meal replacement plan'. You choose two highly nutritious Slim·Fast meals for two of your meals such as breakfast and lunch, and prepare your own healthy 600-calorie evening meal. You can add up to three snacks a day to help keep you feeling satisfied between meals − fruit and vegetables are ideal. Slim·Fast works as a weight loss plan because it is structured and calorie counted, helping you keep to the diet and avoid over-eating. Click to find out more about the Slim·Fast Weight Loss Plan.

How does the Slim·Fast 3·2·1 Plan Work?

The Slim·Fast 3·2·1 Plan is designed to be easy and convenient. You should replace 2 meals a day with a Slim·Fast meal replacement (for example breakfast and lunch) and your third meal should be a healthy, nutritious meal of 600 calories for a female and 800 calories for a male. We recommend that you have fruit or vegetables for snacks, but we also have a great tasting range of Slim·Fast weight loss snacks for convenience − all less than 100 calories. The plan is designed to deliver a total intake of between 1,200−1,400 calories per day. In addition, you should aim to drink between 1.5−2 litres of water per day. It is also important that whilst on the plan you aim to do 30 minutes of moderately intense physical activity every day. Click to find out more about the Slim·Fast Weight Loss Plan.

Does the Slim·Fast 3·2·1 Plan actually work?

Yes, the Slim·Fast weight loss plan has been proven to work, and there are a number of studies to support its effectiveness. If you'd like to know more, please see Does Slim.Fast work.

How quickly can I lose weight with the Slim·Fast 3·2·1 Plan?

As weight loss varies considerably between individuals, it is impossible to predict exactly what any individual may lose following the Slim·Fast 3·2·1 Plan. Losing weight quickly can be unsafe, and experts recommend a healthy weight loss of between 1−2lbs per week. Providing you stick to the plan's calorie recommendation of 1,200−1,400 calories, this should lead to a weight loss of 1−2lbs per week. Weight loss will also tend to be higher the heavier someone is. To check your daily calorie intake, visit the calories counting made easier.

Where can I buy Slim·Fast?

Slim·Fast products are available to purchase in all good retailers. You can also click to buy Slim·Fast products directly from our website.

Is the Slim·Fast 3·2·1 Plan suitable for men?

Men on the Slim·Fast diet can still follow the same plan, but because their calorie requirements are higher, we recommend they consume between 1,600–1,800 calories a day. To achieve this, men should increase the calorie content of their evening meal to around 800 calories.

Can I swap my meals around?

Of course you can! As long as you combine two Slim·Fast meal replacements, two to three healthy 100 calorie snacks, and a sensible third meal of 600 calories. We recommend that you cook your own meal in the evening, because we think that it is probably the moment of the day when you have time to cook, and most of all when you are able to share a normal meal with your family. Feel free to organise your meals as you wish as long as you follow the plan!