grabbing shakeThe OPTIFAST Program is based on the use of meal replacements during the Active Weight Loss phase of the program. Simple and effective, OPTIFAST meal replacements allow you to benefit from:  High-quality, complete nutrition pre-portioned and calorie-controlled servings;  quick and simple preparation;  freedom from having to make food choices. Positive change can occur very quickly. In addition to losing weight, you will improve your health, learn new, healthier eating habit,  and engage in activities so that when you return to self-prepared foods, you are better equipped to manage your weight long term.