3.7/5 (43 reviews)
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Overall Rating3.7 out of 5
See all 43 reviews

About SlimFast

SlimFast is a weight loss and diet plan that makes protein-enriched shakes and other weight loss products. Slimfast’s 3-2-1 program (three snacks, two shakes and one meal a day) helps you lose weight and curb hunger through meal replacements. Find out if SlimFast is right for you by visiting their profile today.

Pros & Cons


  • Built-in calorie counting
  • Keto, diabetic and low-carb options
  • Available in grocery stores everywhere
  • Vegetarian products and recipes
  • No foods are off-limits


  • Doesn’t teach portion control
  • No personalized support

Bottom Line

SlimFast is a weight loss program that uses meal replacement products like shakes and snacks to help customers reach their goal weight.

Top SlimFast Reviews


I started Slim-Fast a year ago and in 6 months I lost 16 pounds! I am usually horrible when it comes to dieting but the Slim-Fast plan is pretty straightforward and if you really ...

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I love the caramel and the cappuccino delight. In the year I have been drinking the shakes I have lost 30 #’s and feel great. I use my own snacks during the day such as cheese sti...

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What is SlimFast?

SlimFast is a short-term weight loss program that uses meal replacement products to help you lose weight. The company’s 3-2-1 plan teaches participants to lose weight by having three snacks, two shakes and one meal every day. To get started on a SlimFast diet plan, visit its website and fill out the sign-up form with your name, email address, age and gender.

Once SlimFast receives this information, the company sends you a free SlimFast Quick-Start Guide with tips, tricks and recipes to jump-start your weight loss journey.

No foods are off-limits on the SlimFast diet. When you buy the company’s packaged snacks, you don’t have to worry about portion control or counting calories except when you’re eating your one meal of the day. While there’s no formal program, SlimFast encourages participants to exercise regularly to get the best weight loss results.

SlimFast products

SlimFast products are available everywhere in the United States. While its most popular product is the signature SlimFast shake, the company has other weight loss products, including:

  • 100-calorie snack packs
  • Shake mixes
  • Meal bars
  • Coffee creamer

SlimFast shakes come in regular, low-sugar and high-protein options. Each serving of SlimFast’s original shakes contains 120 to 130 calories, 10 grams of protein, 5 grams of fiber and 24 vitamins and minerals. The shakes are gluten-free, lactose-free and have the same amount of caffeine in them as a cup of coffee. There are five flavors:

  • Rich Chocolate Royale
  • French Vanilla
  • Strawberries and Cream
  • Cappuccino Delight
  • Creamy Milk Chocolate

SlimFast diet plans

Outside of its original diet plan, SlimFast has expanded its product line to include the following specialized plans:

  • Diabetic Weight Loss is a SlimFast plan formulated for Type 2 diabetics that includes meal bars, shake mixes and snacks.
  • Keto is a plan that emphasizes a low-carb and high-fat intake. SlimFast Keto includes shakes, shake mixes, meal bars and snacks designed with minimal carbs and healthy fats to motivate your metabolism.
  • Advanced Energy has more caffeine than your typical coffee. Advanced Energy products give you an extra boost from their high energy content.
  • Advanced Nutrition has fewer carbs and twice the protein. Slimfast Advanced Nutrition’s extra protein curbs your appetite while keeping your sugar intake low.

Does SlimFast work?

SlimFast is a short-term weight loss program that helps you lose excess weight by replacing meals with the company's signature SlimFast shakes. If you’re searching for a quick way to lose weight and don't need structured exercise programs or portion control guidance, SlimFast is a good choice to help lose a few pounds.

SlimFast Reviews

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Page 1 Reviews 0 - 10
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Verified Reviewer Verified Buyer
Original review: Jan. 19, 2023

Just bought this yesterday and tried my first drink this morning. It tasted so bad, it tasted like a chemical of some sort. Not sure I can drink another one. Vanilla was all Walmart had available or I would have tried chocolate. Terrible taste and it definitely doesn't keep you feeling full like others I have tried. I bought the 20gr protein drink.

2 people found this review helpful
Verified Reviewer
Original review: Feb. 22, 2022

I had all hopes in Slim Fast. I love the taste of their ready to drink advanced shakes. However, I have struggled so much trying to open the bottle with the plastic wrapping. I would literally have to use my teeth to open up the bottle. Therefore, I won't be using slim fast. I just wish they would have a simple twist off the cap bottle.

12 people found this review helpful

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    Verified Reviewer
    Original review: June 25, 2021

    If you keep up with the plan it works. Drinks, food, follow all the instructions. But if you have other conditions such as thyroid and other problems it doesn't work as well but it helps along with the meds. I would say it's a good product overall.

    9 people found this review helpful
    Verified Reviewer
    Original review: June 13, 2021

    I was unsure about diets altogether but when I started using SlimFast I was surprised to get the results you are trying to achieve with a little exercise. I actually did lose weight while I was using it.

    9 people found this review helpful
    Verified Reviewer
    Original review: June 12, 2021

    Easy to use and follow, does not cost that much. Has lots of good products now for meals and snacks. Great flavors and always on sale at local stores or even Amazon. Take with you on the go, no mess or hassle to make anything.

    4 people found this review helpful
    Verified Reviewer
    Original review: June 11, 2021

    SlimFast it has wonderful taste that fixes Rich. It's more like you're drinking a mulch and then a diet product. I've used it periodically now and then. There's always had good results with it. I don't think I have to say much more than that. That alone should speak for it.

    2 people found this review helpful
    Verified Reviewer
    Original review: June 10, 2021

    The time I tried Slim Fast for weight loss it worked pretty well. I lost 30 lbs???. But years later I tried again and only lost 10 ☹️. I guess it just depends on the person and what you're going through at the time.

    6 people found this review helpful
    Verified Reviewer
    Original review: Feb. 28, 2021

    I actually gained weight drinking these. They seem to make me more hungry than I normally am. I stopped drinking these and actually lost some weight. I don't know what this drink has in it but it seems to make me depressed. I won't ever buy these again.

    12 people found this review helpful
    Verified Reviewer
    Original review: Aug. 3, 2020

    Both my spouse and I have used Slim Fast. I like the chocolate flavor; he likes vanilla. We often make shakes in the morning by putting skim milk, slim fast and ice cubes into our blender. The slim fast comes out thick and frosty and super delicious. Slim fast satisfies our appetite.

    18 people found this review helpful
    Verified Reviewer
    Original review: July 24, 2020

    I am a big fan of Slim-Fast. I have been taking Slim-Fast for over 10 years. I would recommend anyone to drink Slim-Fast shakes along with a low calorie meal and a exercise regimen but I also would tell anyone to go to the doctor before starting any diet. I will also advise anyone to walk 2 miles a day and do cardio and swimming exercise. I dropped two pants sizes in a year. Slim-Fast comes in a variety of flavors. My favorite was strawberry. I'll have a steak in the morning and during lunch hours and then eat a low calorie meal and I drink plenty of water.

    16 people found this review helpful
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    SlimFast Company Information

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