How Does SlimFast Work? | The SlimFast Plan Explained

How It Works

How It Works

How does SlimFast Work? It works in a way that is right for you!

For over 40 years, SlimFast has been helping millions of Americans take control of their diet, lose the weight and keep it off®. Now after more than 40 clinical studies, the SlimFast diet plan has been perfected to include more options than ever before.

Just replace any two meals with SlimFast shakes, bars or cookies, enjoy one sensible meal of your choice and three 100-calorie snacks in between. SlimFast includes different formulas to suit a variety of needs and preferences, including SlimFast Original, SlimFast Advanced Nutrition, SlimFast Advanced Energy, SlimFast Keto, and SlimFast Diabetic Weight Loss Formula.

New to our family of products is SlimFast Keto. Our NEW line of premium products is the perfect choice for making optimal low-carb, ketogenic nutrition easy as 1-2-3. SlimFast Keto makes Keto easy with a simple, clinically proven plan that includes decadent, indulgent and convenient products to enjoy at home and on-the-go.

To get more information on The SlimFast Keto Plan, download your SlimFast Keto Quick-Start Guide, which includes a meal planner, shopping list, recipes, and tips to help you become Keto Confident. Sign up for your SlimFast Keto guide today!

The SlimFast diet plan lets you choose what to eat so you can always stick to it, no matter how unpredictable your days can get. Don’t skip Sunday brunch with your friends or stay back when your coworkers head out for lunch together. Just make that meal your sensible meal of the day and have your shake, smoothie or bar for the other two meals. You’ll be amazed at how easy it is to plan meals when you have a daily routine that is easy to follow. To get more information on The SlimFast Plan, download your SlimFast Quick-Start Guide, which includes a meal planner, shopping list, recipes, and tips to help you get started. Sign up for the SlimFast guide today!

For maximum results, avoid sugar-sweetened beverages, like juice and sodas. They will only slow down your weight loss and make you tired. Drink plenty of water and get in 30 minutes of daily exercise instead. You’ll burn calories and release feel-good endorphins that will keep you smiling all the way to your goal weight.

You deserve 30 minutes of me-time every day. Make the time for a daily walk or pick a fun new activity to try!


SlimFast has more than 40 published clinical studies designed and conducted by independent researchers. The research shows that The SlimFast Plan is proven to help you lose weight fast and keep it off. You can see results in just one week.* Check out our clinical studies.

Does SlimFast Work For Men?

Men, don’t worry. We understand that you typically need a few more calories than women do. Adjusting the SlimFast diet plan for men is easy!  All you have to do is add 200 calories to each SlimFast meal replacement. Use 2 scoops instead of 1 when you’re making a smoothie, eat 2 bars or cookies, or add a mini-meal of your own.  For recipe ideas, check our healthy meal options.

How Do you Use SlimFast To Keep The Weight Off?

Once you hit your goal, you can start replacing one meal a day with a SlimFast shake, bar or cookie and eat two sensible meals of your choice every day. If you’re worried you’ll miss snacking in between meals, we’ve got your back. Our 100-calorie snacks will still be important to keep your metabolism burning, and your snack-game strong.

Don’t stop exercising! Thirty minutes a day gives you a much better chance of keeping the weight off, and a positive attitude that will brighten yours and everyone else’s day.

Now that you’ve mastered how to lose weight with SlimFast, what are you waiting for? We can’t wait to hear your success story!

No matter your reason for losing weight, SlimFast wants to help you achieve your goals fast*. So, what are you waiting for? Get started today with your FREE Quick-Start Guide!

Sign Up