The SlimFast diet is a commercial calorie limiting eating plan which first appeared in the late 1970s. The diet was at first a shake only plan but later incorporated SlimFast bars. The current version was modified in the late 2000s and uses the 3-2-1 format standing for three SlimFast snacks two SlimFast meal replacements and a well-portioned dinner.

It works by replacing some meals with SlimFast alternatives while allowing participants to have one daily meal of their own. The high protein and low-calorie composition of the SlimFast diet plan coupled with daily exercise can be very effective for rapid weight loss and this has made it a favorite over the years.

The Process of The SlimFast Diet Plan

The SlimFast diet plan offers six meals throughout the day. Five meals are off the shelf SlimFast products in the form of shakes, meal bars and snacks. The products are usually high in protein and low in overall calorie and help participants achieve the daily recommended limit of 1200 calories for women and 1600 calories for men. The SlimFast menu is also high in fiber and oils which help keep hunger at bay during the course of the eating plan.

A daily exercise routine is an important complement to the SlimFast menu and around 30 minutes of physical activity is advised. The whole process usually lasts around 8 to 10 weeks where up to 20 pounds (9 kilograms) can be shed. The diet allows alcohol in moderation but intake should be regulated as not to add calories.


  • It is an easy and convenient eating plan to follow.
  • It is quite affordable compared to other commercial plans.


  • The foods in the diet are heavily processed.
  • It is not sustainable in the long term.

Who Should Do It

The SlimFast diet is a time tested method of losing weight quickly and is suitable for those looking to trim the waistline within a short time, for perhaps a special event. It is not highly recommended in the long run but individuals usually take an on and off approach to help in eight control.

Meal Plan Ideas

Day 1

  • Breakfast: SlimFast Creamy Milk Chocolate Shake
  • Snack: 1-ounce almonds
  • Lunch: SlimFast Chocolatey Peanut Butter Pie Bar
  • Snack: SlimFast Cinnamon Bun Swirl Drizzled Crisps
  • Dinner: Roasted salmon with one olive oil, baked sweet potato with chopped broccoli
  • Snack: Baby carrots with hummus


Day 2

Breakfast Vegetable omelet

Snack: SlimFast Peanut Butter Chocolate Bites

Lunch: SlimFast French Vanilla Shake

Snack: Baby carrots and hummus

Dinner: SlimFast Creamy Milk Chocolate Shake

Snack: Sour Cream & Onion Baked Chips


Day 3

Breakfast: SlimFast Creamy Milk Chocolate Shake

Snack: 100-calorie SlimFast Mesquite BBQ Baked Chips

Lunch: SlimFast Chocolatey Peanut Butter Pie Bar

Snack: 100-calorie SlimFast S’Mores Drizzled Crisps

Dinner: Steak tacos

Snack: Nuts