The well-documented weight loss success of the OPTIFAST Program is based on the use of meal replacements products during the active weight loss and maintenance phases. Dr. Treyzon has investigated the safety and efficacy of these diets  at UCLA. His results are published in peer reviewed journals and conference presentations.

The benefits of meal replacement products include:

• High-quality, complete nutrition in fewer calories than can supply the same nutrients in a traditional low-calorie foods diet
• Pre-portioned and calorie-controlled servings
• Quick and simple preparation
• Freedom from having to make food choices and from handling and     preparing foods (a food holiday)
• Limited number of flavors and textures reduces the desire to eat

People are often skeptical about their ability to follow a meal replacement diet. Most are pleased to find they adjust to the new way of eating in a week or less and often report they feel more energetic than usual.

Following a full meal replacement diet has been shown to be the quickest non-surgical method to lose a significant amount of weight and experience other important health changes like lower blood pressure and blood sugar levels.

OPTIFAST is the original medical weight loss program. It has been available in the US for over thirty years, and during that time, it has been used safely by more than a million people and been the subject of over 84 different research articles.

The OPTIFAST Program is a comprehensive medical weight loss program that combines a specialized meal replacement formula diet with medical monitoring to ensure safe and effective weight loss and a behavioral change program that address all aspects of successful weight management including diet, physical activity, and lifestyle skills like stress management and creating a realistic self image.

The OPTIFAST program was developed at a teaching hospital in the US and gradually spread to other healthcare institutions here and abroad. It has been used safely and successfully for over thirty years by more than a million people. Not only was OPTIFAST the first medical weight loss program, it was also the first weight loss program of any type to publish both short- and long-term weight loss results.

The safety and effectiveness of the OPTIFAST nutritional products and the OPTIFAST medical weight loss program have been proven in over 84 research papers, published in leading science and healthcare journals.

Since its inception, the OPTIFAST Program has incorporated proven new weight loss techniques and nutritional advances while maintaining the high quality program and core strengths that have built its reputation for healthy success.

Long-term Results: Highlights from the 5-Year Outcome Data Long-term outcome data from a study of over 600 people, 5 years after completing the OPTIFAST Program, found that the majority of individuals kept off a medically significant amount of weight.

• Over 50% kept off enough weight to sustain improvements in heart health risk factors like blood sugar, blood pressure and blood cholesterol levels
• 25% kept off nearly all the weight they lost during the program