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Pros & Cons for Slim-Fast

author image Natalie Stein
Natalie Stein specializes in weight loss and sports nutrition. She is based in Los Angeles and is an assistant professor with the Program for Public Health at Michigan State University. Stein holds a master of science degree in nutrition and a master of public health degree from Michigan State University.
Pros & Cons for Slim-Fast
Woman with a healthy drink. Photo Credit Carey Hope/iStock/Getty Images


Slim-Fast is a weight loss company with an online diet support program. Slim-Fast sells meal bars and smaller snack bars in various flavors. Its other products are ready-to-drink shakes and powdered shake mixes. You can use these products as the basis for the Slim-Fast diet program, which has some pros and cons for weight loss and health.

Weight Loss

A benefit to the Slim-Fast diet is that if you follow the instructions correctly, you will probably lose weight because you will be reducing your calorie intake. The basis of the program is replacing larger meals with lower calorie meal replacement products, such as shakes or bars. The daily 3-2-1 meal plan from Slim-Fast has three 100 calorie snacks, two meal replacements of about 200 calories each and a single meal of 500 calories. This adds up to a daily total of about 1,400 calories, which is low enough for most adults to lose weight. The diet may also help you lose weight by keeping your metabolism high.


A significant advantage of Slim-Fast is that it is easy to follow. You only need to prepare one meal per day, and the Slim-Fast website provides recipes and ideas for 500-calorie meals. For your three snacks, you can have Slim-Fast snack bars or choose your own 100-calorie snacks. The two meal replacements come from Slim-Fast meal bars or shakes. All you have to do is choose your flavor, and if you choose a powdered shake mix, you can mix it with fat-free milk, and it will be ready to drink. These products require minimal preparation, and you can store them anywhere so that they are available, even when you are busy.

Long-Term Disadvantages

A disadvantage of Slim-Fast is that it may not work well as a long-term meal plan. The Weight-control Information Network recommends choosing a diet that has a variety of foods that you can enjoy for the rest of your life. The plan depends heavily on a limited number of choices of bars and shakes. Another long-term disadvantage of Slim-Fast is that it does not meet the Dietary Guidelines for Americans, which are national recommendations for a healthy diet. While Slim-Fast does provide adequate amounts of most vitamins and minerals, it does not include the recommended amounts of healthy foods, such as whole grains, fruits, vegetables, dairy and legumes. These foods may reduce the risk of diseases, such as cardiovascular disease or diabetes.

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