Nutrisystem has launched a new weight-loss program focused on body type, individual goals and food tastes, just in time for New Year's resolutions. Nutrisystem uses a proprietary algorithm to determine the best plan for a customer, delivers food for more than half of the program's caloric intake to the customer's door, and then leaves the remaining calories from fresh grocery to the customer. The program is designed to work with the brand's NuMi app, which tracks progress, provides challenges and offers other weight-loss guides. The launch comes with 41 new foods, including a selection of plant-based grain and vegetable lunch bowls and cream-filled dessert cupcakes. Nutrisystem is part of the Tivity Health Inc. /zigman2/quotes/200231910/composite TVTY +5.60% portfolio of brands. WW International Inc. /zigman2/quotes/200896816/composite WW +7.28% , better known as Weight Watchers, has also recently launched a new personalized program, and Oprah Winfrey, who is an investor and advisor to the company, will go on tour to support the company. Tivity shares have tumbled 22% over the past year while the S&P 500 index /zigman2/quotes/210599714/realtime SPX +1.55% has gained 31% for the period.