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A shocking two-thirds of U.S. adults are overweight or obese. Almost as many (63 percent) have tried to lose weight at some point, researchers say.

Given those numbers, it's perhaps not surprising that Americans in 2014 were expected to spend $2.5 billion on commercial weight-loss programs, according to a new study published Monday in the Annals of Internal Medicine.

Before spending a lot of money on promises of a trimmer figure, however, people with pounds to shed might want to check out results of the new study, "Efficacy of Commercial Weight-Loss Programs: An Updated Systematic Review."

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The research team led by Dr. Kimberly A. Gudzune of Johns Hopkins University School of Medicine in Baltimore found that just two commercial weight-loss programs -- Weight Watchers and Jenny Craig -- showed long-term scientific results that were better than following one's own diet.

Other popular programs, such as Nutrisystem, showed promising weight-loss results but additional studies are needed to evaluate long-term outcomes, the authors said.

Because the majority of weight-loss programs have never been studied in randomized clinical trials, the researchers said they ended up with 39 trials covering 11 programs.

Included were three programs they described as "high-intensity" Weight Watchers, Jenny Craig and NutriSystem which incorporate goal setting, self-monitoring, nutritional information and counseling.

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Three very-low-calorie meal replacement programs HMR, Medifast and OPTIFAST were also included, along with five self-directed programs Atkins, SlimFast, and the Internet-based Biggest Loser Club, eDiets and Lose It!

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Study: Only 2 commercial weight-loss programs show long ...

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Home » Long Term Weight Loss » Study: Only 2 commercial weight-loss programs show long …