Weight Loss Shakes
Our diet range offers a variety of blends that combine the perfect ingredients and nutritionals to help you achieve your body shape goal. This includes our Impact Diet Whey — with key diet additions including green tea extract and L-carnitine. To find out more, check out our selection below or take a look at our diet and weight loss range for high-protein foods and supplements aimed to help you on your weight-loss journey.
Shop Weight Loss Shakes at Myprotein
Weight loss shakes are one of the most practical tools in a calorie-controlled routine — high in protein, convenient to prepare, and designed to fit around a busy lifestyle. At Myprotein, the range covers everything from lean whey isolates to fully loaded meal replacement shakes, giving you real options depending on your goal and your day.
Whether you're looking for a low-calorie shake to slot into a structured diet plan or a protein-rich meal replacement that pulls double duty, there's a format here that fits. Each product is developed by Myprotein's expert nutritionists with specific macros in mind — so you're not just grabbing something off a shelf, you're picking something built for a purpose.
Who Weight Loss Shakes Are For
These shakes are built for people who are actively managing their calorie intake and want a convenient, high-protein option that fits their plan. That could mean someone replacing a meal to stay within a daily target, or someone who trains regularly and needs a lean protein hit without a lot of added calories getting in the way.
They're equally useful for people who struggle to hit their protein targets through food alone. A diet shake takes the guesswork out of tracking — the macros are right there on the label, the prep takes seconds, and you know exactly what you're consuming. From desk workers to gym-goers, the format suits anyone who wants structure without the fuss.
When to Use Weight Loss Shakes
Timing depends on how you're using them. As a meal replacement, a weight loss shake works well at breakfast or lunch — slots in the day where convenience tends to win over cooking. Protein Meal Replacement Blend, for example, is high in protein and fibre with a broad micronutrient profile, making it a solid stand-in for a full meal within a calorie-restricted eating plan. Substituting two daily meals of an energy-restricted diet with meal replacements contributes to weight loss1, and substituting one daily meal contributes to the maintenance of weight after weight loss2.
As a post-training shake, something like Impact Whey Isolate — with up to 26g of fast-absorbing protein per serving — fits well in the window after a session when you want protein without a lot of extra calories. The key is matching the product to the moment: meal replacement shakes for structured eating, leaner protein shakes when you just need the protein hit.
Weight Loss Shakes Benefits
High Protein Content
Protein is the cornerstone of any weight loss shake worth considering. Options like Impact Whey Isolate deliver up to 26g per serving, and Impact Diet Whey pushes that to up to 36g. Protein contributes to the growth and maintenance of muscle mass3 — important when you're in a calorie deficit and want to hold onto the muscle you've built.
Structured Calorie Control
Every shake in this range comes with a clearly defined nutritional profile. That means you know exactly how many calories, grams of protein, and grams of carbs you're getting — no estimation required. For anyone tracking intake seriously, that level of transparency makes diet shakes a genuinely useful tool.
Broad Micronutrient Profiles
Several options in the range — particularly the meal replacement formats — are packed with vitamins and minerals alongside the macros. That matters when you're eating less overall, since hitting your micronutrient targets gets harder as total food volume drops. Vitamin B12 contributes to the reduction of tiredness and fatigue4, and vitamin D contributes to the normal function of the immune system5 — both relevant when you're pushing through a structured diet phase.
Convenience Without Compromise
Weight loss shakes mix in seconds, travel easily, and remove the friction that often derails a diet. When the alternative is skipping a meal or grabbing something that doesn't fit your plan, having a shake ready to go is a straightforward win. The range spans powders, so you can control your serving size and mix strength to suit your needs exactly.
Popular Picks
Impact Whey Isolate Powder — If you want serious protein without the calories, Impact Whey Isolate Powder delivers up to 26g of fast-absorbing protein per serving for just 109 calories.
Protein Meal Replacement Blend — Protein Meal Replacement Blend is built for those who want a convenient, nutrient-dense swap for a full meal, with high protein and fibre alongside a broad range of vitamins and minerals.
Impact Diet Whey — Impact Diet Whey packs up to 36g of protein per serving alongside green tea extract, CLA, and added choline — making it one of the most ingredient-rich options in this category.
FAQs
What are meal replacement shakes?
Meal replacement shakes are calorie-controlled drinks formulated to substitute a full meal, providing a defined blend of protein, carbohydrates, fats, fibre, vitamins, and minerals in a single serving. They're designed to sit within a structured, calorie-restricted diet rather than simply adding extra nutrition on top of regular meals. Substituting two daily meals of an energy-restricted diet with meal replacements contributes to weight loss1.
What's the difference between weight loss shakes and regular protein shakes?
Weight loss shakes and diet shakes are typically formulated with a lower overall calorie count and a broader nutritional profile than standard protein shakes. A regular protein shake focuses primarily on delivering protein — often 20-26g per serving — with minimal extras. A weight loss or meal replacement shake adds vitamins, minerals, and fibre to the mix, making it a more complete stand-in for food rather than just a protein top-up.
Are meal replacement shakes good for weight loss?
Meal replacement shakes are a practical tool within a calorie-restricted diet plan. The key is that they're used to replace meals — not added on top of them. When used as directed, substituting one daily meal of an energy-restricted diet with a meal replacement contributes to the maintenance of weight after weight loss2, while substituting two daily meals contributes to weight loss1.
Which weight loss shake should I choose?
If you're looking for a lean, high-protein option with minimal calories, Impact Whey Isolate delivers up to 26g of fast-absorbing protein per serving and is ideal as a post-training shake within a calorie-controlled plan. For a more complete meal substitute, Protein Meal Replacement Blend is high in protein and fibre and packed with vitamins and minerals — better suited to replacing a full meal. Impact Diet Whey offers up to 36g of protein per serving and includes choline, which contributes to normal lipid metabolism6.
Can I use weight loss shakes as meal replacements every day?
Meal replacement shakes are designed for daily use as part of a structured, calorie-restricted diet. Most formats are suited to replacing one or two meals per day rather than all meals. Using a product like Protein Meal Replacement Blend at breakfast or lunch, alongside a balanced evening meal, is a common approach that keeps nutrition varied while still supporting a controlled calorie intake.
How many calories are in weight loss shakes?
Calorie content varies across the range depending on the product type and serving size. Lean protein shakes like Impact Whey Isolate are on the lower end, while meal replacement formats provide a more substantial calorie count to genuinely stand in for a meal. Each product clearly lists its nutritional breakdown per serving, so you can match the shake to your daily calorie target with accuracy.
Are slimming shakes suitable for people who train regularly?
Slimming shakes can work well alongside a regular training schedule, particularly when protein content is high enough to support muscle maintenance. Protein contributes to the maintenance of muscle mass3, which is especially relevant when you're in a calorie deficit. Options like Impact Whey Isolate and Impact Diet Whey are built with high protein content specifically for active people managing their weight.
Who developed the weight loss shakes at Myprotein?
Every weight loss shake in the range is developed by Myprotein's expert nutritionists. Each formula is built around specific macronutrient targets, with the ingredients, protein sources, and micronutrient profiles selected to meet the needs of people following a calorie-restricted diet — whether they're training regularly or simply focused on managing their intake day to day.
Are these weight loss shakes available in Ireland?
The full range of weight loss and meal replacement shakes is available to order across Ireland, including Impact Whey Isolate, Protein Meal Replacement Blend, and Impact Diet Whey. Delivery options to Ireland are available directly through Myprotein, with the same product range accessible as in the UK.
What's the best time of day to have a diet shake?
The best time depends on how you're using the shake. Meal replacement formats work well at breakfast or lunch — moments where convenience tends to take priority and where a structured, nutritionally complete shake fits naturally into the day. Leaner protein shakes are well-suited to the period around training. There's no single right answer; the best slot is the one that fits your routine and helps you stay consistent with your calorie goals.
1. Substituting two daily meals of an energy restricted diet with meal replacements contributes to weight loss.
2. Substituting one daily meal of an energy restricted diet with a meal replacement contributes to the maintenance of weight after weight loss.
3. Protein contributes to the growth and maintenance of muscle mass.
4. Vitamin B12 contributes to the reduction of tiredness and fatigue.
5. Vitamin D contributes to the normal function of the immune system.
6. Choline contributes to normal lipid metabolism.