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The SlimFast Diet: Does It Help With Weight Loss?

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SlimFast – The SlimFast plan is a popular weight loss program that has been around for decades.

It consists of meal replacement shakes and foods designed to support weight loss.

Many people claim to have successfully lost weight with a simple and practical plan, but you may wonder if it works and is long-lasting.

What Is Slimfast?

The SlimFast diet is a weight loss plan that started in 1977.

The original diet consisted of two low-calorie meal replacements daily with a “smart” dinner.

Since then, the company has expanded its product line to include shakes, smoothies, bars and snacks. We also offer products in Original, Advanced Nutrition, Advanced Energy, Diabetic Weight Loss and Keto formulations.

The Enhanced SlimFast Diet is based on the 1-2-3 plan and includes 1 “smart” meal, two replacement meals, and three snacks per day. In the 1-2-3 plan, you can choose from 4 versions: Original, Favorite, Keto and Low Carb.

The company claims you can lose weight in a week, but many sceptics find the diet unsustainable and expensive.


Slimfast is For What?

SlimFast products are designed for those who want to lose weight quickly and easily.

The product is low in calories and easy to pack, making it a great choice for busy people looking to lose weight.

Its products are also commonly purchased by people who want a simple diet that includes minimal grocery shopping and food preparation.

However, these products are not cheap and may not be accessible to all budgets.

How Does Slim Fast Work?

The SlimFast diet is a partial meal replacement plan that includes 1 “smart” meal, two replacement meals, and three snacks per day. This is called the “SlimFast 1-2-3 Plan” or “SlimFast Plan”.

You can choose to follow one of four versions of this plan.

This plan uses the popular product SlimFast, over 40 years old. However, the company appears to be phasing out these plans favouring their Favorite Foods, Keto, and Low-Carb plans. Original.

Your favourite foods. This plan has no specific macronutrient goals and allows for one “SlimFast Approved” meal per day within calorie limits. This is considered the company’s most flexible and easy-to-follow plan.

Keto. Designed for those on the keto diet, this plan focuses on a high-fat diet by combining SlimFast keto products with a “smart” meal. This plan is the hardest to follow due to the strict macronutrient goals required to maintain ketosis.

Low carb. Unlike the keto plan, the low carb plan focuses on eating a lower fat diet and reducing your carb intake.

Whichever plan you choose, you’ll be asked to prepare one meal yourself daily, but there are guidelines on what foods to include, and the company recommends keeping your meals under 600 calories.

SlimFast Set App

SlimFast Together is a relatively new application provided by the company to help you track and achieve your weight loss goals.

When you first open the app, you take a 5-minute quiz to check your goals and preferences.

You can then use the app for meal planning by selecting pre-approved recipes or adding your recipes. The app also has a built-in calculator that lets you know if you’ve reached your daily calorie, macronutrient, and water goals.

Perhaps the most convenient aspect is the Grocery Order feature, which automatically creates a shopping list from prepared menu items and allows you to place an order for grocery delivery or pickup at your location. Local retailer.

The app also includes a progress tracking feature to enter information about your current weight, measurements, diet, fluid intake, exercise, sleep, and stress. You can also add progress photos.

It together is available as a free download for Apple and Android devices.

How To Get Started With Slimfast?

SlimFast offers four plans: Original, Favorite Foods, Low-Carb, and Keto.

To sign up for a Favorite Foods, Low-Carb, or Keto plan, you must first download the Together app.

If you’re unsure which plan to choose, take a quick quiz in the app, and you’ll be recommended a personal plan based on your goals, preferences, and lifestyle.

When choosing a plan, you can choose a pre-designed meal plan or create a custom meal plan for your state. The app can then retrieve a shopping list and use it to go to the store or order groceries online.


What Can You Eat At Slimfast?

There are no forbidden foods on the SlimFast diet, but you must limit your calories. You should watch your macronutrient intake if you’re on a keto or low-carb diet.

Alcohol is allowed, but the diet suggests minimizing consumption.

To allow for flexibility, the diet allows one “smart” meal per day, including any food selected from the “SlimFast Approved” meal list. It depends on the plan you follow.

Additional instructions depend on the plan you choose. For example, the Keto plan requires you to follow a high-fat diet and only use SlimFast keto products.

Sample Meal Plan

The SlimFast website and the SlimFast Together app offer a variety of sample meal plans. Here’s an example of what a day’s meal might look like in each plan.

Favourite Food Sample Meal Plan

  • Breakfast: Meal Shake
  • Snack: Banana
  • Lunch: SlimFast Mill Bar
  • Snack: 3 cups air-popped popcorn (24g)
  • Dinner: Chicken Tikka Masala
  • Snack:  Double Chocolate Mint Crunch Mini Snack

Low Carb Diet

  • Breakfast: Grilled Vegetable Omelet
  • Snack: 1/2 cup (143 g) Greek yoghurt
  • Lunch: t Meal Shake
  • Snack: 1 piece of cheese
  • Evening:  Diabetes Weight Loss Meal Bar
  • Snack: Diabetic Diet Snack

An example of a keto diet

  • Breakfast: Ketomeal Shake
  • Snack:  Keto Fat Bomb Crispy with Real Cheddar Cheese
  • Lunch: SlimFast Keto Fat Bomb Meal Bar
  • Snack: fried roast pumpkin
  • Dinner: Grilled salmon with lemon butter and steamed asparagus
  • Snack:  Keto Fat Bomb Dark Chocolate Almond Snack Square

For men, the program recommends adding 200 calories to each SlimFast meal replacement or doubling the amount of meal replacement.

Is Slimfast Effective For Losing Weight?

The SlimFast diet may promote weight loss by reducing calorie intake, creating a calorie deficit.

If you follow the program correctly, you will only consume about 1,200 calories daily. Considering that an average, moderately active woman needs about 2,000 calories daily, you’re missing at least 800 calories.

Additionally, since SlimFast recommends around 1,600 calories per day for men, a calorie deficit can be 800 to 1,400 calories per day.

Some older studies on its products suggest they can promote significant weight loss. However, most research on SlimFast is older, possibly due to a growing trend toward programs promoting sustained weight loss.


The SlimFast diet remains a popular weight loss program despite its many shortcomings. It is commonly referred to as the SlimFast 1-2-3 plan or the SlimFast plan.

You can achieve short-term weight loss by limiting your calorie intake by following one of SlimFast’s 1-2-3 plans (Original, Favorite Foods, Keto, or Low-Carb). However, most studies show that diets like this are not sustainable.

Additionally, the diet relies on highly processed meal replacements and does not teach you how to maintain weight loss once the user stops the program.


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