NutriSystem Weight Loss System:

This at-home system (no office visits or weigh-ins) will appeal to those who don't like to cook. It involves exclusively eating the company's prepackaged meals. The 28-day program includes breakfast, lunch, dinner and snacks (you may add fresh vegetables, fruit and dairy). Support is offered through a free Web site.

"Some people lose 1 pound a week; some people lose 3 pounds a week," says a NutriSystem sales representative. If, on average, you lose 2 pounds a week, the diet will take about four months. It's cheaper to sign up for the Auto-Delivery Savings program (the food keeps coming until you cancel it), which costs $293.72, including shipping, per month.

Cost of losing 30 pounds: $1,174.88, including all food, except fresh fruits, vegetables and dairy.

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