Product Comparisons, Product Reviews

PhD Diet Whey vs. USN Diet Fuel Ultralean

This time in our versus series, we’re pitting two diet wheys against each other. PhD Diet Whey vs. USN Diet Fuel Ultralean, two of the worlds biggest diet whey powders.

They are both high in protein whilst being low in calories and sugar, making them brilliant to reduce body fat and promote weight loss. They are also good at building lean muscle, which again aids weight loss and body fat reduction. 

In this blog post, we’re going to be comparing a number of different factors. We’re going to be taking into account not only the calories and protein content, but the price and reviews of both of these

Comparing The Calories

Per serving, Phd Diet Whey has only 91 calories with a scoop only big enough for 25g of the product. This is a brilliant way to reduce the number of calories in your shake. Now, once you’ve mixed the product using a blender or a shaker, depending on what you’ve used, it may increase or decrease the calories. If you used water, then you will have 91 calories still, but milk will increase the calorie content.

Usn Diet Fuel Ultralean is a lot higher, however, as it has 200 calories per serving, but this is with a 55g scoop. When you scale it down to the serving size of PhD Diet Whey, it actually beats it – coming in with 90 calories per 25g scoop. The reason why it is initially higher is that USN market the product as a meal replacement shake. This means you have more powder in your shaker, thus satisfying your hunger.

So for calories, PHD Diet Whey narrowly misses out on this section, with USN Diet Fuel taking the win.

Diet Whey

Protein Content

When you compare a diet whey, you need to see how much protein is in each serving – this may be the ultimate deal breaker for some people.

PhD Diet Whey has 17g of protein per serving. Whilst this is lower than traditional whey proteins, it is important to note that due to there being fewer calories, there will be less protein per serving.

USN Diet Fuel Ultralean has 25g of protein per serving. But as we mentioned in the calorie section, the serving size is more than double the size than PhD. So when you scale it down, Diet Fuel has only 12g of protein per serving.

This means that the PhD Diet Whey takes this section. With having over 30% more protein that its USN counterpart. But, as we’ve said, it is important to note that diet wheys will usually have less protein as there are only so many calories per serving.


So for the price to be fair, we’re going to be comparing the price of both of the 2kg variants of each product. Since USN Diet Fuel Ultralean’s servings are double the size of PhD Diet Whey, we’re going to be scaling the servings down to PhD’s level – since calories are almost identical as well, we feel it’s the best way to do it.

So per serving, PhD Diet Whey will cost you only 73p per serving. This price is based off the price of £28.99 (as of November 2020).

USN Diet Fuel Ultralean will be scaled down to match PhD Diet Whey. In the new 40 servings measurement, it will cost you 79p. This price is 8% higher than PhD Diet Whey, meaning that technically PhD Diet Whey is cheaper.

Diet Fuel Ultralean

Diet Whey & Diet Fuel Reviews

Henry from GymTalk reviewed PhD Diet Whey and commented on the great taste of the product. However, he did not there was a little grainy texture, which will be because of the flaxseed oil.

BestProteinPowder also raves about the product from PhD. Some of the highlights they wrote is how it uses your body fat as fuel. It also contains flaxseed and green tea for added weight loss benefits.

Now, onto the reviews for Diet Fuel Ultralean. Muscle and Fitness Supplements Review highlights the fact that on Amazon, it has 5 stars from 71% of the people who bought it. They also firmly state that they believe that the product is genuinely worth the money that they paid for it.

SupplementReviewsUK also recommends the product. They think that all of the factors considered against the price, it is definitely something that is worth a shot in your weight loss journey.

Which Is Best?

So there you have it. We hope you enjoyed our product comparison and if you want to pick up a diet whey, then we definitely recommend either one of these two fantastic products.

If you want the least amount of calories, then USN Diet Fuel Ultralean is for you. With only 90 calories per 25g, it is one of the lowest you find across the entire market.

If you want more protein, then PhD Diet Whey is for you. With more than 30% more protein than USN, it is the clear winner. 

For the price, they’re more or less the same again. However, PhD has inched ahead of USN again. With PhD costing 73p per 25g instead of USN’s 79p.

USN Diet Fuel Ultralean

  • 25g Protein Per Serving
  • High in Fibre
  • Only 2g of Fat
  • Low Sugar
  • Helps to Stabilise Metabolism & Sugar Levels.

PhD Diet Whey 2kg

  • >3g of sugar per serving
  • Only 5g of carbs
  • A whopping 34g of protein per two scoops
  • Palm oil-free
  • Contains potential fat-loss ingredients – CLA, l-carnitine, green tea extract and flaxseed

PHD Diet Whey Protein Powder 1kg

  • A high protein premium diet whey powder that aids lean muscle building
  • Low in fat, sugar and salt
  • 17g protein & only 91 calories per 25g serving when mixed with water
  • Contains CLA, l-carnitine, green tea extract and flaxseed

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