Weight Watchers, Jenny Craig top slimming options

The US researchers found that while these two programs ranked highest in the comparison of commercial weight loss approaches, good clinical trials were scarce and few studies collected data for 12 months or longer. 

The 45 included studies examined data on the success of Weight Watchers, Jenny Craig, Nutrisystem, Health Management Resources, Medifast, Optifast, Atkins, the Biggest Loser Club, eDiets, Lose It! and Slimfast.

The researchers found that people using Weight Watchers and Jenny Craig lost 2.6% and 4.9% more of their weight, respectively, than