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Home » Lose Weight » Diet Plan Review: Best Ways to Lose Weight – CBS News

The TV ads, filled with celebrity endorsers and regular people holding out their enormous "old jeans," make the diet plans sound terribly tempting. Although an FTC rule now requires testimonial ads to cite typical results, the looming question still remains: Which of these diet programs are worth your money?

To find out, MoneyWatch analyzed eight of the biggest diet plans. Three are support-only plans that don't require you to buy their food, and five are food-delivery plans. We interviewed leading nutritionists and weight-loss professionals, pored through clinical studies, and tallied up membership fees and food costs to determine the ones most likely to help you slim down and to see how much you'd pay to drop 20 pounds.

Our favorite for value and efficacy is Weight Watchers, designed to help you change your eating habits for good. Nutrisystem is the least expensive meal delivery plan we reviewed (Medifast is cheaper, but you have to provide one meal a day on your own). And the silver-spoon award undoubtedly goes to In The Zone Delivery, a white-glove service for people who'll spare no expense to drop the pounds.

Here's how the plans stack up. See the handy chart at the bottom of the page for a side-by-side comparison.

Cost: Choose the 39.95 monthly pass, which includes unlimited meetings and online support. If you wont go to meetings, try three months of online-only services for $53.85 (with automatic renewal at $17.95 a month thereafter), plus a $30 sign-up fee.

The skinny: The oldest national weight-loss program, its members rave about the encouragement they get at weekly meetings led by former Weight Watchers dieters. Nutritionists praise the portion-control points system: Each food is assigned points based on its serving size, calories, fiber, and fat; and no foods are forbidden. Your point allowance is based on your weight, height, gender, age, and activity level. Weight Watchers has done a good job incorporating cognitive behavioral change to weight management, says Martin Binks, professor of psychology at Duke University Medical Center.

Does it work? Yes. A recent clinical study in the New England Journal of Medicine linked group counseling sessions to weight-loss success. That explains why Weight Watchers has impressive short-term results. A 2005 study in the Annals of Internal Medicine showed participants lost an average of about 5 percent of their body weight (10 pounds) in six months. Two years later, they had kept about half the weight off. To help members stay on track, Weight Watchers encourages them to attend meetings until theyve stayed within 2 pounds of their goal weight for six weeks. After that, you get free lifetime membership. The company says members using its online tools in addition to attending meetings lost 50 percent more weight than those going to meetings alone.

How much can you expect to lose? Up to 2 pounds per week

Cost to lose 20 pounds: $160 for three months of unlimited meetings plus one more month to complete the maintenance period. For the online-only option, plan on spending $72 for the same four months.

Cost per pound of weight loss: $4 or $8, not including food

Worth the money? Yes. Its economical and has a proven track record.

We looked at two plans from eDiets one that offers support alone, and another with meal delivery.

Cost: The support-only plan runs about $18 per month or $99 a year, billed to your credit card (with a $25 fee if you cancel within three months). The optional meal delivery service, eDiets Fresh Prepared Meal Delivery, costs $110 per week for five days of meals or $140 for a full week, plus $22 shipping, and includes the online service.

The skinny: You can choose from among more than 20 diet plans, including ones for diabetics and vegetarians. Online tools let you set goals, plan menus and generate shopping lists. Theres no face-to-face support, but you get support through online message boards, and you can reach a registered dietitian and personal trainer by phone at any time. The optional meal delivery service offers freshly prepared, calorie-controlled meals delivered in a cooler.

Does it work? People really seem to love message boards, but there is no data yet to show whether they are effective in helping with weight loss, says Binks. But telephone support has some evidence in its favor: A couple of studies have shown that telephone support is just as effective as live support, says Christine Gerbstadt, M.D., spokeswoman for the American Dietetic Association.

How much can you expect to lose? 1 to 2 pounds per week

Cost to lose 20 pounds: For online membership, $54 for three months. For meal delivery, which includes online membership, $1,716 to $2,106 for 13 weeks.

Cost per pound of weight loss: $2.70 for online-only plan; about $86 to $105 for meal delivery.

Worth the money? Online membership: Yes, its a bargain for round-the-clock support. Meal delivery: No for about the same money, other services offer better track records.

Cost: $5 a week after a free seven-day trial with a minimum commitment of four weeks, plus the cost of the South Beach Diet book.

The skinny: Southbeachdiet.com is an online version of the good carbs/good fats diet created by cardiologist Arthur Agatston. For the first two weeks, you eat three extremely low-carb meals a day plus two snacks. After that, you gradually add good carbs, such as fruits and whole grains. You can customize menus, search a database of more than 1,000 recipes and get a personalized shopping list. Theres online support from staff dieticians and members plus daily motivational emails.

Does it work? Studies have shown that after one year, carb-restricted diets led to greater weight loss and increased heart health than low-fat diets. However, the advantage disappeared over the long term.

How much can you expect to lose? Figure on 8 to 13 pounds during the two-week kick-start phase, then 1 to 2 pounds a week thereafter.

Cost to lose 20 pounds: $55 for nine weeks, including the book

Cost per pound of weight loss: $2.75, not including food

Worth the money? Maybe: It doesnt cost much, but you dont get as much support as with Weight Watchers or eDiets.

Cost: About $40 to $50 per day (plus a $10 delivery fee) for three meals and two snacks depending on whether you choose chef selected or custom.

The skinny: The Zone diet is mostly meat, fruits, and vegetables. Home-delivered gourmet frozen meals have a ratio of 40 percent carbs/30 percent proteins/30 percent favorable fats, designed to promote stable insulin levels, increased energy and weight loss. You eat three meals per day plus two Zone protein-powder snacks.

Does it work? Yes. A 2007 study of 160 people in the Journal of American Medical Association found the Zone diet helped people achieve modest weight loss after one year, comparable with those on the Atkins, Weight Watchers and Ornish diets, and improved cardiac risk factors.

How much can you expect to lose? Many customers lose 5 pounds a week, but dont get confused: Some of this is water weight, says Don Ruttenberg, CEO of Fresh Food Delivered, the company behind In the Zone Delivery. What you really lose in body fat is 1 to 1.5 pounds per week.

Cost to lose 20 pounds: $5,600 to $6,720 for 16 weeks of food, depending on your food choices

Cost per pound of weight loss: $280 to $336

Worth the money? No, unless youre looking for white-glove service.

Cost: Pricing information is noticeably, frustratingly absent from the Jenny Craig Web site. A sales agent told us that the program fee will soon change to $30 for 30 days. Meals average $5 a pop; the total cost for 3 meals and two snacks a day runs $18 to $22.

The skinny: Premium-priced Jenny Craig offers nutritionally balanced packaged food; you order by phone and pick it up at a Jenny Craig center or have it delivered through Jenny Direct (for a $65 delivery fee). You eat three Jenny Craig meals plus a snack per day, and supplement with fruit, vegetables and dairy. The food may lack zesty flavor, but it teaches portion control through visualizing, so when you go out to eat in a restaurant youll know how big a piece of meat you want to eat, says Gerbstadt. Once a week, you get a weigh-in and pep talk with a consultant who is not a dietician and who earns commissions from selling you products. Theres also round-the-clock phone support and online tools that include a menu planner, activity planner and progress tracker.

Does it work? Jenny Craig has a good track record for short-term weight loss (up to one year). In a UC San Diego clinical trial of 442 dieters (funded by Jenny Craig), Jenny Craig clients lost 11 percent of their initial weight after 12 months, compared with 3 percent weight loss by those who were dieting on their own.

How much can you expect to lose? 1 to 2 pounds per week

Cost per pound of weight loss: $96

Cost: About $145 a week for weekdays only or $180 for seven days, including snacks plus $25 FedEx delivery. (Shipping is free the first week.)

The skinny: The doctor-designed Bistro M.D. program aims to provide a rotating menu of FedExd, portion-controlled, frozen meals that are a cut above the usual packaged diet fare. (The price is a cut above the competition, too.) The plan tries to help you avoid a weight-loss stall out by varying the daily calorie intake between 1,100 and 1,400. By eating a little more some days and a little less on others, youll supposedly prevent your body from becoming used to the same number of calories every day. Bistro M.D. doesnt do much in the way of organized support, but you can speak with a registered dietitian by phone upon request.

Does it work? While no university studies support the theory that varying caloric intake aids weight loss, the high quality of the food and the relatively large portion sizes have been praised by Health magazine, Dr. Phil and The New York Times. Some plan users have complained of a lack of choices and menu flexibility compared to other plans, but a company spokesman says they offer more than 100 entrees and can make substitutions to accommodate allergies and food preferences.

How much can you expect to lose? 1 to 3 pounds per week

Cost of losing 20 pounds: $1,525 to $2,025 for 10 weeks of food

Cost per pound of weight loss: About $76 to $101

Worth the money? Yes: Its a reasonable price for well-made food with slightly faster average weight loss than with Jenny Craig.

Cost: $329 for a 28-day plan that includes nonperishable ready to go meals or $299 for 28-day plan in which one-third of the meals are fresh-frozen. Theres also a $148, 14-day starter program available through Walmart.

The skinny: This meal-delivery service, endorsed by Marie Osmond and Dan Marino, emphasizes foods with a low glycemic index. The underlying premise is that controlling blood sugar levels leads to weight loss. The heat-and-eat prepared meals and snacks contain 55 to 60 percent good carbs, and 20 to 25 percent each of protein and fats; like Jenny Craig, you add fruits, vegetables and dairy. Support is available through phone counseling, weekly e-classes with a dietician and tracking tools.

Does it work? Theres plenty of research showing that following a diet of 1,200 to 1,500 calories a day, such as Nutrisystem, can cause weight loss. For example, a study by the Obesity Research Center at St. Lukes Roosevelt Hospital in New York found that postmenopausal women who followed a 1,200-calorie plan for 16 weeks lost an average of 21 pounds.

How much can you expect to lose? 1 to 2 pounds per week

Cost of losing 20 pounds: $1,196 to $1,316 for four 28-day cycles

Cost per pound of weight loss: $60 to $66

Worth the money? Yes: For a meal-delivery diet system, Nutrisystem is more economical than Jenny Craig.

Cost: $75 a week

The skinny: Although todays program is not as stringent as the original liquid fast Medifast launched decades ago, the low-fat, relatively low-carb plan is designed to bring about rapid weight loss by coaxing your body into a fat-burning state known as ketosis. With the Medifast 5 & 1 Plan, you eat five small meal replacements a day that are about 100 calories each (which you order online and have delivered) plus one lean and green meal you prepare, consisting of about 500 calories of lean chicken, fish or meat plus three servings of low-carb salad or green vegetables. The 70 meal replacement choices include shakes, bars, soups, pudding, oatmeal, chili, pretzel sticks, cheese puffs, and scrambled eggs.

Does it work? If you can stick with it, a diet of 1,000 calories a day can certainly induce rapid weight loss. A common concern with such low-calorie diets is that youll quickly regain the weight, but in a small clinical trial published in the journal Experimental Biology, after 10 months, only about one in five people regained all the weight they had lost.

How much can you expect to lose? 2 to 5 pounds per week

Cost of losing 20 pounds: $300 to $750, depending on the speed of your weight loss, plus grocery costs for your lean and green meals

Cost per pound of weight loss: $15 to $38 (plus groceries)

Worth the money? Maybe: Choose this more extreme plan only if quick weight loss is your priority.

Support-Only Plans

Food Delivery Plans

This article was updated by Eileen P. Gunn.

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Home » Lose Weight » Diet Plan Review: Best Ways to Lose Weight – CBS News