The popular Nutrisystem diet program is a portion-controlled eating plan with prepackaged foods delivered to your home. It offers different programs for men, women, vegetarians, seniors, and people with type 2 diabetes. The meals emphasize lean protein and carbohydrates with a low glycemic index such as whole grains and vegetables. In addition to pre-packaged foods, vegetables, fruits, low-fat dairy, and lean proteins from the grocery store are added to the meal plan. Nutrisystem was created in the early 1970s by entrepreneur Harold Katz. It began as a liquid protein diet and evolved into a heat-and-eat meal delivery service in the 1990s.

The diet's premise is that it's easier to lose weight if you don't have to plan and prepare meals. Having access to ready-made, pre-portioned meals and snacks can help keep daily caloric intake low, leading to weight-loss.
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