Weight Watchers Weight Loss System:

This is one of the most popular diets in the world, probably because there's no such thing as taboo food. The diet is based on portion control and involves weekly support meetings. You can also do the program online.

The Flex plan means each food is assigned a point value, and you can eat anything as long as you stay within your allotted points. The Core plan involves a preapproved list of foods. Though there are plenty of Weight Watchers food items on the market, they are optional.

Registration is between $15 and $20, depending on location. Weekly meeting fees range from about $10 to $15, again, location-dependent. The standard monthly plan for Weight Watchers Online costs $46.90 the first month and $16.95 for subsequent months. Plan to lose 1 to 2 pounds per week for 20 weeks to reach a 30-pound weight-loss goal.

Cost of losing 30 pounds: $214.80 to $299.80, depending on location, or $97.75 online, not including food.

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