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Introduction

When it comes to deciding on a weight loss diet to follow, there a literally hundreds to choose from. One of the most popular choices is the SlimFast diet – a worldwide dieting organization with with millions of followers.

You’ve probably seen their low calorie meal replacements and snack bars in health food stores up and down the country.

In this SlimFast Shakes review, we’re look at whether these shakes are genuinely good for weight loss.

Readers please note that statements on this page are fair comment based on observation. This content is produced on a matter of public interest. Statements on this page are our honest opinion.

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What Are SlimFast Shakes?

SlimFast Shakes are low-calorie meal replacement shakes, produced by a company named KSF Acquisition Corporation.

One tub contains enough shake-mix powder for 18-20 servings and costs between $10.00-20.00; it is available in most high street food stores as well as online via the official SlimFast Shakes website.

The overall concept for the SlimFast shakes isn’t a complicated one; you simply commit to drinking 2-3 per day in place of your breakfast, lunch and dinner in order to significantly lower your daily calorie intake.

Do SlimFast Shakes Work?

Based on our research into this product, we believe that the SlimFast Shakes could be a very useful tool for targeting a leaner physique, but only if they’re used in the context of a low-calorie diet and regular exercise routine.

As we mentioned above, these shakes are simply meal replacements that are low in calories and fortified with vitamins and minerals – they do not contain any ingredients that will “burn away body fat”.

In order for the shakes to really deliver weight loss results, you should be following the SlimFast Diet, or similar calorie-restricted shake diet program.

By replacing all of your daily meals (i.e. breakfast, lunch and dinner) with a one SlimFast Shake, you’ll be bringing your daily calorie intake down to the point where losing weight will be inevitable – essentially you’ll be on a VLCD (very low calorie diet).

Make no mistake, using these shakes for weight loss will not be an easy ride, you’ll need willpower and determination by the bucketload; liquid-only diets are never particularly fun to stick to, and most people will likely find themselves regularly battling cravings, however if you’ve got the staying-power you’ll reap the rewards.

The Pros & Cons Of SlimFast Shakes

Below we have compiled a complete list of everything that we personally believe could be viewed as either a positive or negative aspect:

The Pros

  • Very affordable product.
  • A good low-calorie replacement for a meal.
  • Contains vitamins and minerals.

The Cons

  • Formula doesn’t contain any ingredients that will directly and independently “burn body fat”.
  • Product is unlikely to cause appetite suppression.
  • Doesn’t contain ingredients that will help boost your metabolic rates.
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What Are The SlimFast Shake Ingredients?

We have found the following information from the Superdrug website:

One Serving Contains: Skimmed Milk Powder, Sugar, Maltodextrin, Fructose, Corn Oil, Inulin, Acacia Gum, Xanthan Gum, Lactose, Cellulose, Milk Proteins, Sodium Carboxymethyl Cellulose, Potassium Phosphate, Calcium Phosphate, Soya Lecithin, Tocopherol-Rich Extrac, Sodium Ascorbate, Magnesium Oxide, Ferric Pyrophosphate, Vitamin C, Zinc Gluconate, Vitamin E, Niacin, Vitamin A, Copper Gluconate, Manganese Sulphate, Sodium Selenite, Vitamin D, Folic Acid, Vitamin B6, Thiamin, Riboflavin, and Biotin.

Are SlimFast Shakes Suitable For Everyone?

Those with allergens to milk or soy should not use this shake.

Women who are pregnant or breastfeeding, or anyone under the age of 18 should consult with a dietician before using the SlimFast shakes for the purpose of weight loss.

What Are SlimFast Shakes Side Effects?

We’ve compiled the following potential side effects based on the ingredients inside this formula:

  • Increased bowel movements
  • Nausea
  • Increased thirst
  • Bloating
  • Cramps
  • Tiredness
  • Headache [1]

Note: these side effects are possible but may not be the typical user experience.

Are There Any SlimFast Shakes Reviews From Customers?

We have found the following SlimFast Shakes review testimonials from consumers online:

The chocolate flavors was not very nice at all, but i do like the strawberry. I’d recommend that people pick up all the different flavors because if you’re drinking them every day the same old flavor can make things boring.

I have seem nothing short of amazing results from SlimFast, the shakes were a godsend to me. I went from 254lbs to 179lbs in 18 months. I’d replace two meals per day and then just have a sensible evening meal (didn’t exercise because my knees are shot). I feel like if i can do it, anyone can.

Me and my hubby have been on the slimfast shakes for a few months now, he’s lost about 10lbs, myself 7lbs (he’s much more active than i am). I think we’ll stick with it.

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Our Final Verdict On SlimFast Shakes

To conclude our SlimFast Shakes review, it’s a bit of a mixed bag – there are things that we like about it and things that we aren’t too blown away by.

For the most part, we believe that the price is a very accurate reflection of what you’re actually getting – a vitamin-infused low calories milkshake mix. Obviously it’s not the most advanced weight loss shake out there, but if you’re on a budget then it’s certainly something you could keep on your hit-list.

Remember, losing weight with the SlimFast shakes will require lots of dedication and willpower.

Kath Ross, PhD
Kath Ross, PhD
Health Editor & Fact Checker at DietProbe
Kathryn is a Ph.D Health Editor here at DietProbe. She specializes in diabetes and weight control research and in her spare time she's a professional cat lady and wine connoisseur!
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Fact Checked


This article has been reviewed and fact-checked by a certified nutritionist, and only uses information from credible academic sources.