SlimFast Review (UPDATE: 2019), 15 Things You Need to Know

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SlimFast Review – 15 Things You Need to Know

SlimFast is a well-established line of meal replacement shakes and bars. The company claims that the current version of the product has been perfected following more than fifty clinical studies, offering more options than ever before. However, the SlimFast program works in conjunction with a sensible, calorie-restricted meal plan and regular exercise. There are many diet products that work well in tandem with calorie counting and a consistent exercise plan, and SlimFast products do not contain ingredients that are formulated to rapidly burn fat.

Nonetheless, our research team wanted to look into the current offerings to determine how they stack up. Read on to learn about the modern line of SlimFast options, and to get the Bottom Line on the product as a whole.

SlimFast can be purchased through their Official Site.

What Is SlimFast?

SlimFast is a weight loss program that supposedly makes it easy to lose weight. It provides different options. The SlimFast plan is not limited to a specific set of foods to consume. You can choose delicious food options that suit your preferences. It’s not just about eating fruits and vegetables or making do with shakes and smoothies.

This SlimFast review, by the way, is for the new system under a new administration. Unilever sold the SlimFast brand in 2014. With this transfer of ownership come some tweaks and improvements. This new system takes into account numerous clinical studies to improve the SlimFast diet plan with more diet choices.

As a branded weight loss method, the commercial aspect of it is noticeable. If you go to the website, the official website of this weight loss plan, you will see not only diet plans and recipes but also for-sale products that are essential for you to follow the SlimFast diet plan.

NOTE: To avoid confusion, here’s a brief clarification. SlimFast is a brand name that refers to a diet plan and a range of products. If you want to do this weight loss plan, you will have to follow the SlimFast diet plan and purchase SlimFast products which include meal replacement shakes and smoothies as well as SlimFast snacks.

SlimFast Competitors

read Burn TS (Sample offer)

This is how much it costs to start on the respective program. We always recommend trying a product before making a large investment.

    = Initial product cost is less than $5 = Initial product cost is between $6 and $50 = Initial product cost is between $51 and $150 = Initial product cost is $151 or more

How Did SlimFast Start?

SlimFast is said to have been in practice for more than 40 years.

The SlimFast brand (diet plan and products), as mentioned earlier, used to be owned by Unilever.

At present, the company responsible for the development and manufacture of SlimFast products is KSF Acquisition Corporation located in West Palm Beach, Florida, USA.

We couldn’t easily find information about KSF Acquisition Corporation online. What we learned, though, is that this company is an investee of Kainos Capital, which acquired the SlimFast brand from Unilever back in 2014.

Scroll below for one of the best products we’ve seen over the last year.

SlimFast Claims

The SlimFast plan promise is simple. It claims to provide significant weight reduction without having to get hungry and without having to struggle with tasteless meals.

It promises the shedding of pounds with one sensible meal for the day complemented by meal replacements and tasty SlimFast snacks. Moreover, it claims that results become noticeable in just one week.

As stated on, you can achieve 50% more weight reduction by using the SlimFast diet plan as compared to reduced-calorie diets.

SlimFast Products And Ingredients

Here’s a summary of SlimFast’s products:

SlimFast Shakes

  • The shakes are individually bottled for immediate
  • They are available in 4 flavors: rich chocolate, caramel latte, mocha cappuccino, and vanilla.
  • The shakes contain 20 grams of protein, 5 grams of fiber, 1 gram of sugar, 1 gram net carbohydrates, and 24 vitamins and minerals.
  • Every bottle of the SlimFast shake contains the same amount of caffeine in a cup of coffee.
  • This new formulation (as compared to the Unilever formulation) is claimed to be 99.8% lactose-free.

SlimFast Smoothies

  • The smoothies are sold in mixes. The tubs provide enough product for approximately 12 smoothies
  • The smoothies come in two flavors: mocha cappuccino and mixed berry yogurt.
  • Each smoothie serving contains 20 grams of protein, 5 grams of fiber and 24 vitamins and minerals.
  • Each serving provides the same amount of caffeine you can get from a cup of coffee.
  • The smoothies are gluten-free.

SlimFast Cookies

  • The SlimFast cookies are also labeled as meal replacements. They are available in double chocolate chip and peanut butter chocolate flavors.
  • Every pack contains 100 calories, 10 grams of protein, and 5 grams of fiber.
  • Each cookie is labeled “4-hour hunger control” so it should provide energy for at least 4 hours before you consuming your next meal or meal replacement.

SlimFast Bars

  • These are available in two flavors: “chocolate peanut butter pie” and “chocolate crispy cookie dough.”
  • Each pack contains 100 calories, 15 grams of protein, 5 grams of fiber, and 1 gram of sugar.
  • SlimFast bars are also meant to provide 4 hours of hunger control.

SlimFast Chips

  • These are available in two flavors: baked chips and drizzled chips.
  • Each pack contains 100 calories, 5 grams of protein, and 5 grams of fiber.
  • Each snack pack should keep hunger at bay for 4 hours.

Unfortunately, we couldn’t find information about the specific ingredients used in SlimFast’s products (shake, smoothie, and snacks). The only information available is that these products are gluten-free and high in fiber.

Does SlimFast Work?

When followed correctly, SlimFast does work. This structured diet program can deliver the weight loss it promises if you stick to how it’s meant to be used. However, the claim of losing weight without being mindful of the sizes of the portions you eat is not accurate.

SlimFast involves the reduction of the number of calories you take so you can’t just go on consuming delicious food without imposing limits.

As Dr.Brunilda Nazario of WebMD opined, the SlimFast plan works for weight loss. With it being a structured program, it is suitable for those who don’t have the patience and meticulousness to count calories.

Nazario says that the use of one or two meal replacements can promote weight loss and helps in maintain the desired weight longer.

SlimFast Benefits And Results

The SlimFast website features various testimonies from users of the SlimFast diet plan. These include male and female users. They claim to have lost weight in the range of 20 lbs. to 42 lbs. These user testimonials are posted on

The testimonials come with respective full names and brief backgrounds, making the testimonials appear to be more valid, and not mere fabrications.

For those who don’t have health issues but are trying to lose weight, SlimFast should be a compatible weight loss option.

If you can handle a low-calorie diet, you should be able to follow the SlimFast diet plan.

However, it is recommended consulting your doctor first before committing to the SlimFast plan. This is particularly important for those who are taking medication for their conditions.

Details On SlimFast And Weight Loss

There are no scientific or clinical studies specifically aimed at exploring the effectiveness of adopting a SlimFast only diet plan. However, the makers of SlimFast are citing a long list of research publications made to appear that they support the idea of using the SlimFast diet plan and SlimFast products.

We couldn’t find links to the specific research publications so we couldn’t ascertain if the research was conducted to prove or disprove the claims of SlimFast. The research appears to support health benefit potentials associated with SlimFast’s different components, not studies intentionally conducted to explore the effectiveness of SlimFast products.

How To Use SlimFast?

SlimFast is designed to enable a low-calorie diet that is easy to follow. Here’s a summary of how this diet plan works.

  • You will have to eat six times per day.
  • The six times include eating one sensible meal*, and two meal replacement** shakes or smoothies.
  • With the six times that you eat per day, you have to consume a total of 800 to 1,500 calories per day, well within the standard definition of a low-calorie diet.
  • Each SlimFast meal replacement shake or smoothie has about 120-130 calories.
  • Each SlimFast snack has 100 calories.
  • The amount of calories in the single “sensible” meal you eat for the day depends on liking. It could be from 500 to 1000 calories. You just have to avoid overeating for this meal.
  • In addition to eating six times a day, you also need to exercise for at least 30 minutes daily.
  • You also have to drink plenty of water (at least eight glasses per day).
  • Once you achieved your target weight, you can switch to having two sensible meals per day, and one meal replacement. The 30-minute daily exercise routine should also be maintained even after achieving your desired weight.

A sensible meal is one that is similar to what you have been used to eating before you started the SlimFast plan.

It should not be filled with comfort food but something that comes close to one of the meals you consume to achieve a balanced diet. For a guide on what a sensible meal is like, refer to the recipes on

SlimFast offers two types of meal replacements: shakes and smoothie mixes. The smoothie mix may be added to milk or other beverage. According to LiveStrong, you need to make sure that the milk you use does not contain more than 50 calories. Otherwise, the calorie count for your smoothie replacement will be significantly raised.

SlimFast snacks can either be 10-gram cookies or 15-gram protein bars.

The standard SlimFast diet plan is mainly intended for women (1 meal + 2 meal replacements + three snacks). For men, SlimFast meal replacement and snack intake just need to be augmented to 200 calories.

This means that instead of using one scoop of the SlimFast meal replacement, two scoops will be needed (to get 200+ calories).

Instead of eating one energy bar or a pack of cookies or bar, for example, twice the amount will have to be taken.

The SlimFast Taste

SlimFast is touted as a diet plan that lets you eat delicious food. As such, it’s worth evaluating the taste.

In reality, it would be difficult to come up with a truly objective assessment of the taste of SlimFast products since taste is rather subjective. However, based on what users are saying, there are those who say that the meal replacements contain too much sugar.

Some say the coffee products seem to taste like they contain burnt coffee beans. Still, there are those who say that they like the taste of SlimFast products.

Perhaps, a more sensible way to put it is to say that SlimFast tastes just like how a typical diet would taste.

The adjective “delicious” as used in SlimFast’s marketing apparently refers to the standard taste anyone would expect in ordinary “delicious” food—that is sweet food should be sweet and savory should be savory.

SlimFast recipes, meal replacements, and snacks are not meant to cut down on sugar, salt, and other typical ingredients that create the flavor everyone is accustomed to.

The goal is more on controlling the amount and type of meal eaten. It’s also about choosing the right food to eat.

Potential SlimFast Side Effects

Like most other products, SlimFast is far from perfect. It is not free from side effects. Different people have different reactions to its products and SlimFast recipes.

Some users report having experienced diarrhea after using SlimFast products.

This is something that cannot be totally ruled out since too much consumption of protein does have adverse effects, one of which is diarrhea.

SlimFast promotes low-calorie intake, which may lead to minor side effects such as constipation, fatigue, and nausea. published an article on the side effects of SlimFast shakes.

It reported that the use of sugar substitutes in the sugar-free versions of SlimFast shakes might cause gas build-up in the stomach and possibly diarrhea in some users.

To avoid the unwanted effects of imposing a low-calorie diet, you should consult a diet or health expert.

SlimFast Product Warnings

As a low-calorie diet, it’s important to be aware that the reduced intake of calories may have an impact on blood sugar levels. It’s important to work with a nutritionist when trying any form of weight loss plan that involves alterations on typical food intake.

Additionally, a SlimFast diet may also interfere with medications. Adjustments may have to be made to avoid health problems or complications.

Low-calorie diets should only be adopted by those who have a BMI of at least 30. It is also not advisable for pregnant women and breastfeeding mothers. says that it is possible to drink alcohol while taking the SlimFast diet plan. However, alcohol can reduce the weight loss efficacy of this diet plan especially if you take in a lot of calories from mixers.

Any SlimFast Lawsuits?

We did not find lawsuits against SlimFast, at least for the new SlimFast under KSF Acquisition Corporation. Likewise, we didn’t find FDA advisories regarding SlimFast meal replacement and snack products.

What we found was an advisory for SlimFast Lipo Fast Burner Capsules Weight Loss for Men. This is apparently one of the products when the brand was still under Unilever.

The FDA advisory warns that SlimFast Lipo Fast Burner is not a registered product and has not undergone the evaluation of the agency. The public is hence advised not to buy it.

Since the SlimFast products available on the website don’t include the products mentioned in FDA advisories, it’s safe to say that there are no health risks or concerns reported regarding them.

SlimFast Alternatives

If you don’t like the taste of SlimFast’s meal replacements or you can’t handle the system it imposes, you can try other weight loss plans. LiveStrong suggests to consider the following alternatives:


This is a comprehensive low-calorie diet plan (about 800 calories per day) that also involves the use of meal replacements. However, it’s not something you can do on your own like SlimFast. The plan entails medical supervision as well as counseling and lifestyle education. You will also have to take in vitamin and mineral supplements following the Optifast plan.


If you prefer something that affords greater flexibility, Medifast is something you might want to consider. It lets you choose a plan that involves 4 Medifast meals (meal replacements), 2 self-prepared meals, and 1 healthy snack. This plan lets you consume around 1,300 calories per day.

DIY Shakes And Snacks

SlimFast is mainly about taking a low-calorie diet by substituting two of your three meals for the day with meal replacement (shakes or smoothies) and eating three snacks (for the day) with 100 calories each.

If you are not fond of the taste of SlimFast’s meal replacements and snacks, you can just create your own. You just have to make sure you get enough nutrition with them and that they are around 100 calories each.

Recommended ingredients would include lactose-free yogurt, non-fat milk, raw cacao powder, flaxseed, various berries, peanut butter, and unsweetened almond milk.

What Users Are Saying

“Appetite is down and I snack less. The shakes have higher carbs and calories than I like to so in order to make sure I keep the calorie intake down I am take by Biotek Nutrition – Weight Loss Aid Diet Pill Blocks the Absorption of Carbs and Fats before meals. Works like a charm.”

“The vanilla flavor is really good. However, not really satisfying as to curbing hunger pangs. Lasts only a short period of time.”

“Tastes great EXCEPT (or perhaps I should say because), the first ingredient is sugar. Way too much sugar for me.”

The Bottom Line on Slim Fast

So, are you heading out to buy a case of SlimFast Advanced Shakes? Well, we like the longevity of the company and it’s affordable, but we’re hesitant about this one because the research doesn’t directly link it to weight-loss, there are no dedicated peer-reviewed studies and elements in the formula that could disrupt or slow the digestive process, like fiber, to reduce hunger and slow the onset of appetite are missing. We’re also concerned about the fact that beverages are not as effective as solid foods in terms of satiety.

Do you want to trim down a bit? If so, we suggest going with a supplement with a formula containing clinically tested ingredients shown to help promote weight-loss. It’s not that we’re putting down SlimFast products, we just tend to err on the side of our scientific research.

Among the best products we’ve seen this year is one called Burn TS. It features four clinically-tested ingredients which have been shown to help accelerate metabolism, ignite fat loss and fight hunger. We’ve found some pretty amazing user reviews and customer service rocks.

Also, the makers of Burn TS are so confident in their supplement, they’re offering a 2-Week Sample.

Some Slim Fast products contain caffeine – as much as a cup of coffee.

Choosing the right weight-loss system can be confusing and often times frustrating. Let us help. Let us know a little more about you and your goals.

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