Slim Fast Diet Plan: Results of a
Ten-Year Research Study

Clinical evidence continues to prove the efficacy and safety of the Slim Fast meal replacement plan in short and long-term weight loss.

In a 10-year study, participants who routinely used the Slim Fast meal replacement plan maintained an average weight loss of six pounds after 10 years while those in the matched group gained an average of nearly 27 pounds over the same time period.

In the Slim Fast group, men maintained an average weight loss of 7 pounds and women an average loss of 5.3 pounds over the 10-year period of the study. In the matched group, men gained an average of 25 pounds and women gained an average of 28 pounds, meaning the average weight of those in the matched group was 32.6 pounds greater after 10 years than the average weight of those in the Slim Fast group. Body weight was documented twice annually during each year of the study. Study participants were also encouraged to increase their physical activity.

To lose weight, those in the meal replacement group substituted a portion-controlled Slim Fast meal or snack replacement for two regular meals and one of three daily snacks. To maintain weight, participants replaced one meal and one snack with Slim Fast product. They were instructed to return to the weight loss plan of two meal replacements per day if they regained weight.