Eat normally five days a week. Fast on two with just 800 kcal of meal replacements — the simplest way to lose weight, no daily diet to think about.
The 5:2 Fasting Plan at a glance
Pick any two days — most people choose non-consecutive days like Monday and Thursday.
The lowest safe allowance — enough to keep you going, low enough to drive weight loss.
Four Shake That Weight products carry your whole fasting day — no cooking, no calorie counting.
Every shake, bar and soup carries 20+ vitamins and minerals — hard to hit on your own at 800 kcal.
You only change how you eat on two days a week, so it fits around a busy, mostly inactive routine. Ideal for women and men with a BMI of 25+ who prefer a simpler, more flexible approach — or who have a little, rather than a lot, to lose.
The other five carry on as normal — work lunches, family dinners, the odd meal out and your usual weekend. Far less to plan around than a diet that has to run every single day.
The 5:2 plan is built for a mostly inactive lifestyle. Only light exercise is recommended; if you want to train regularly, the Active Plan suits you better.
Research into ~800 kcal days has focused on type 2 diabetes — with findings suggesting faster weight loss can help put it into remission. Read more →
Eat regular, healthy food for five days a week. On any two days — ideally not back-to-back — you fast on around 800 kcal of Shake That Weight meal replacements. That's the entire plan.
On a fasting day you don't cook or count — four Shake That Weight meal replacements cover breakfast, lunch, a snack and dinner. Each is nutritionally balanced, so you get the vitamins and minerals that are hard to hit on your own at 800 kcal.
Here's how one fasting day can look — pancakes to start, a shake for lunch, a bar in the afternoon and a second shake for dinner. Every one is a complete meal carrying 20+ vitamins and minerals, so you hit your nutrients without weighing or counting a thing.
Pay in full, or split into 4x interest-free payments with Clearpay.
16 meal replacements
From £6.84 per fasting day
32 meal replacements
From £6.48 per fasting day
64 meal replacements
From £6.12 per fasting day
Willpower is easier when it's only two days, not every day.
Log your fasting days, watch the trend line settle, and lean on the community for the moments willpower dips. MyJurnee keeps the whole routine effortless.
The 5:2 plan is a gentle, flexible start. Many people move to a daily plan when they want faster results — and stay with us long after the scales have done their thing, because the habits stick.
Want the quickest early results? The Total Plan is four replacements a day, every day, with light exercise only — for up to three weeks.
Total Plan · 800 kcal800 kcal on any two days a week, eating normally the other five. The simplest, most flexible way to start losing weight.
5:2 Plan · 2 fast daysReady for faster, steadier loss? The Everyday Plan runs every day — two replacements, a meal you cook and a snack.
Everyday · 1,000 kcalOne replacement a day to anchor the routine. The Shake Club, the community, and the recipes keep you steady.
MaintenanceOn a GLP-1 weight-loss injection (Ozempic, Wegovy, Mounjaro)? See our dedicated Medication Support Plan →
Verified customer reviews — pulled live from Reviews.io, no edits, no AI.
"I have tried several different shakes from different companies and have always come back to Shake that Weight. Not only are the shakes yummy…"
"It make big difference on me thank you "
"My first week on STW very impressed with the meals I have received they are amazing!! Very speedy delivery "
"Fast delivery and tast nice "
"Very happy with the milkshakes I bought, great flavours, easy to mix, so happy they dont give me stomach problems, like alot of other slimmi…"
"Lovely shakes. Thick and tasty"
1,000 kcal/per day
Discover →1,200 kcal/per day
Discover →800 kcal/per day
Discover →GLP-1 Users
Discover →1,500 kcal/per day
Discover →From £6.24 per fasting day, with free UK delivery on orders over £65. No consultant, no contract, cancel anytime.
If you have any medical conditions — type 2 diabetes, thyroid conditions, high blood pressure — or are taking medication, please speak to your GP before starting any weight-loss plan. We can provide a letter for your appointment on request.
The 5:2 Fasting Plan is not suitable for anyone under 18, pregnant or breastfeeding, or with a BMI below 25. It should be followed for a maximum of eight weeks, then step up to a plan with a few more calories — and diets below 800 kcal should only be followed under medical supervision. Always read product labels for full ingredients and allergens. Last clinically reviewed by Dr Helen Pearson, RD on 14 May 2026.
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