As a meal-replacement diet, SlimFast does not meet the USDA's definition of a healthy meal plan since it replaces whole foods with shakes containing artificial ingredients and added sugars.

SlimFast shakes, powders and meal bars are fortified with essential vitamins and minerals. This means they allow you to lower your calorie intake with reduced risk of nutrient deficiency. It's all sorted. SlimFast meal replacement products are formulated to comply with strict national and European standards.

Yes, Slimfast can work for weight loss. Structured programs, like this one, work for people who don't want to count calories. Studies show that people lose more weight when they eat portion-controlled meals or meal replacements.

SlimFast Original products typically have fewer calories, but they may also contain less protein and fiber compared to the Advanced Nutrition line. On the other hand, SlimFast Advanced Nutrition products offer higher protein and fiber content, which can help individuals feel fuller for longer and minimize cravings.

According to SlimFast, the SlimFast diet provides approximately 1,200–1,300 calories per day for women and 1,600–1,700 calories per day for men (3). Additionally, the program recommends pairing the diet with at least 30 minutes of exercise per day to further promote a calorie deficit needed for weight loss.

You can remain on the SlimFast 3,2,1 Plan until you reach your target weight. However, you should never diet below a body mass index (BMI) of 18.5. SlimFast meal replacement products are formulated in line with National and European legislation to meet the highest nutritional standards.

“SlimFast is terrible for you,” says certified nutritionist and a nutritional chef Melissa Eboli. “You'd be better off taking a scoop of sugar and adding it to water than drinking all of the chemical non-food, sugar-laden ingredients that make up SlimFast.”

How Quickly Will You See Results on SlimFast? SlimFast says this on their website: “Give us a week, and we'll take off the weight.” (1) That's a big promise, and their promotional materials say that you can lose up to 5 pounds (lb) in that first week in their Quick Start program.

The SlimFast® Plan is clinically proven to offer a weight loss of between 1-2lbs a week.

Replace two meals per day with any SlimFast meal replacements, including delicious customizable smoothies made with SlimFast shake and smoothie mixes. Enjoy three snacks in between meals to keep hunger at bay. Drink at least 64 oz of water daily. Add 30 minutes per day of light to moderate exercise.

between 1-2lbs a week The SlimFast® Plan is clinically proven to offer a weight loss of between 1-2lbs a week. On average, the plan allows 1,200 calories per day for women and 1,600 calories per day for men. The average woman consumes around 2,000 calories a day.

between 1-2lbs a week The SlimFast® Plan is clinically proven to offer a weight loss of between 1-2lbs a week. On average, the plan allows 1,200 calories per day for women and 1,600 calories per day for men. The average woman consumes around 2,000 calories a day.