Weight Watchers, a comprehensive weight loss program and diet. · WW International, the company producing the Weight Watchers diet. WW International, Inc. offers various products and services, including weight loss and maintenance, fitness, and mindset such as the Weight Watchers comprehensive diet program. Lose weight with the NEW holistic approach. Take the personal assessment, and Weight Watchers will guide you toward your goals. People following the WW plan can expect to lose 1-2 lbs per week.