Nutrisystem, founded in 1972, was initially a weight loss center that provided counseling and weight loss products in its locations across the United States. In 1999, it abandoned its brick and mortar structure and started selling its products online and through an 800 number.

The program, based on the glycemic index, provides specially designed meals and snacks. Clients select their preferred meal-plan and the food is delivered directly to their home. Members can join the company's website for diet and exercise advice as well as community based discussion boards and classes.

Celebrity clients include Marie Osmond, Angie Everhart, Dan Marino and Don & Mary Anne Shula.

Dieting basics for success

Dieting basics will help you to be successful in not only losing weight but keeping it off. These easy tips will help you to transform your habits so that a healthy lifestyle of exercise and smart food choices will become second nature to you.

The simplest way to ease yourself into creating new lifestyle patterns is by making small lifestyle changes while dieting. Telling yourself," I will never eat french fries again" is just setting yourself up for failure. The more you deprive yourself of what you love when you're dieting, the more you will crave what you can't have. Instead, start by reducing your portion sizes. Use smaller plates while you're dieting to trick your eyes into thinking you're eating a full plate of food.

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