MyProteinDiet blend
Myprotein Impact Diet Whey
Prices checked . Re-checked daily from retailers' own product pages. Label checked .
MyProtein Impact Diet Whey costs £1.44 per 25g of protein in the 900g pack (£30.49 at MyProtein). That makes it the 20th cheapest of 21 reviewed animal-protein powders with a live price. It is a diet blend with 59g of protein per 100g and 36g in a 60g scoop, on the manufacturer's label.
- Best for
- People cutting who get hungry between meals and want a filling shake with 7.9g of fibre per 100g.
- Skip if
- You want the cheapest protein, since it carries 59g per 100g against Impact Whey's 72g.
- Watch out
- The advertised 36g of protein comes from a 60g double scoop, twice a standard whey serving.
- Protein / 100g
- 59g
- Per 60g scoop
- 36g
- Per 25g protein
- £1.44
- 900g pack
- £30.49
Our verdict on MyProtein Impact Diet Whey
Myprotein Impact Diet Whey suits people cutting who struggle between meals: its 7.9g of fibre per 100g keeps you fuller than whey and water. Judge it on 59g of protein per 100g, not the 36g headline, which is a 60g double scoop, so a 1kg bag gives about 16 shakes. Green tea extract and CLA give it the diet name, but Myprotein states no dose for either. If you only want protein for the least money, plain Impact Whey is the better buy.
How the price compares
MyProtein Impact Diet Whey against the 3 reviewed powders nearest to it on type and price, on cost per 25g of protein. Each figure is that product’s best in-stock partner listing, packs of 400g and over.
| Product | Type | Protein / 100g | Per 25g protein |
|---|---|---|---|
| PhD Nutrition Diet Whey | Diet blend | 68g | £1.10 |
| Prozis Zero Diet Whey | Diet blend | 98g | £1.23 |
| MyProtein Impact Diet Whey | Diet blend | 59g | £1.44 |
| Bulk Clear Whey Isolate | Clear whey | 80g | £1.48 |
Where to buy MyProtein Impact Diet Whey
Live prices from partner retailers, one row per retailer at its best value pack, ordered by cost per 25g of protein. A bigger pack usually costs less per 25g, so compare like for like.
| Retailer | Pack size | Price | Per 25g protein | Go to retailer |
|---|---|---|---|---|
| MyProtein | 900g | £30.49 | £1.44 | View deal ↗ |
| Amazon UKOut of stock | 1kg | £22.99 | 97p | View deal ↗ |
Sold in 1kg, 2.5kg, 5kg. 2 partner retailers stock a 400g or larger pack.
Price history, 900g pack
Lowest partner price for the 900g pack each day, last 90 days.
Pros and cons
Pros
- 7.9g of fibre per 100g, which is why it sits better between meals than a plain whey
- A three-protein blend of concentrate, milk protein and isolate, so it digests over a longer window
- Genuinely filling if you are using it as a meal stand-in on a cut
- Sold in 1kg, 2.5kg and 5kg, so the per-serving cost comes down if you commit
Cons
- The advertised 36g of protein is a 60g double scoop. Per 100g it is 59g, well below a standard whey
- A 1kg bag is roughly 16 servings at the stated scoop, not the 30-plus you get from a whey of the same weight
- 6.1g of fat per 100g, most of the way to double a standard concentrate
- Green tea extract and CLA are the "diet" part of the name. Neither is going to do the work that your training and your food do
Nutrition and ingredients
From the manufacturer’s published label (Source). The protein blend is 76% of the powder, and the other 24% is what makes it a "diet" product: oat flour, inulin, flaxseed, a CLA preparation, green tea extract, choline and a digestive enzyme complex. That is why protein per 100g lands at 59g rather than the 70g-plus a straight whey manages.
Read the serving size before the protein claim. The 36g figure is a 60g serving, which is two scoops, so it uses twice the powder of a standard whey shake. Our own scraped row says 65g per 100g and the published label says 59g. We use the label.
| Nutrient | Per 100g | Per 60g |
|---|---|---|
| Protein | 59g | 36g |
| Energy | 359 kcal | 215 kcal |
| Carbohydrate | 13g | 7.8g |
| of which sugars | 4.6g | 2.8g |
| Fat | 6.1g | 3.7g |
| of which saturates | 2.6g | 1.6g |
| Fibre | 7.9g | 4.7g |
| Salt | 0.35g | 0.2g |
- Protein sources
- Whey protein concentrate (milk), Milk protein concentrate, Whey protein isolate (milk)
- Sweeteners
- Sucralose
- Emulsifier
- Soya lecithin and sunflower lecithin
- Pack sizes
- 1kg, 2.5kg, 5kg
- Flavours
- Dessert-style flavours in the main. Buyers rate the vanilla and strawberry shortcake; the recurring complaint is sweetness rather than any specific flavour failing.
- Third-party testing
- Informed Sport: no evidence found. Not claimed on the product page. Worth flagging on this product in particular, because it contains green tea extract and CLA rather than whey alone.
- Made by
- MyProtein, a brand of THG plc, Manchester
What the maker does not publish
- Myprotein does not state a dose for the green tea extract, the CLA preparation or the choline anywhere we could find, so there is no way to judge whether the amounts are meaningful.
- Public review volume naming this product specifically is low compared with Impact Whey and the isolate, so the sentiment block below is thinner than we would like and should be read as such.
Method: nutrition figures come from the manufacturer label. Cost per 25g of protein is the pack price divided by the grams of protein in the pack, multiplied by 25.
What buyers say
Quoted word for word and linked, so you can read the full review or thread.
“Impact Diet whey protein could be clearer in advertising serving numbers.”
“The vanilla diet whey is good flavour but over £50 for 2.5kg is steep.”
“Impact Diet Strawberry shortcake, it was delicious!”
Quick answers
How much protein is in Myprotein Impact Diet Whey?
59g per 100g. The 36g marketing figure is a 60g serving, which is two scoops, while a standard whey shake uses 30g of powder, so compare like for like.
Does Impact Diet Whey help you lose fat?
Not on its own. Its 7.9g of fibre per 100g, in a blend with oat flour and inulin, keeps you fuller, which is why it works for people. Fat loss comes from the deficit.
Is Impact Diet Whey better value than Impact Whey?
No, and it is not close. Impact Whey is 72g of protein per 100g in a 30g scoop; this is 59g per 100g in a 60g scoop, so you get roughly half the servings per bag. Buy it for the fibre and fullness.
Can you take Impact Diet Whey if you are drug tested?
Use a batch-tested product instead. We found no third-party testing for this one, and unlike a plain whey it contains green tea extract and a CLA preparation.
Alternatives to MyProtein Impact Diet Whey
PhD Nutrition
Diet Whey
68g protein per 100g against 59g here, if density is what you are after.
£1.10 / 25g protein
Protein Works
Diet Whey Protein Isolate - BLACK Innovation
86g protein per 100g against 59g here, if density is what you are after.
86g protein / 100g
MyProtein
Impact Whey Protein
72g protein per 100g against 59g here, if density is what you are after.
90p / 25g protein
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Label and copy last reviewed 8 September 2026 · Prices last fetched 26 October 2026