Unlike fad diets, the OPTIFAST program has been proven effective in more than 80 clinical studies and by more than 1 million people who have participated in the program since 1974.

OPTIFAST succeeds because it treats the whole you – not just your weight. It combines support and counseling, comprehensive lifestyle education and medical monitoring with a great-tasting meal replacement to help people lose weight and significantly reduce weight-related health risks. One study of 20,000 patients showed:

Five-year follow-up studies show that over 50% of people who complete the OPTIFAST Program keep enough weight off to improve their health long term. What’s the secret? Participants say it’s because OPTIFAST isn’t just a diet – it’s a community that provides ongoing support during and long after weight loss.