Patrick Semansky / AP
In this April 3, 2015, photo, Michele Rouse holds a salad that she made in her kitchen in Edgewood, Md. Rouse says she has lost 7 pounds since she started on Weight Watchers a month ago and has already seen a drop in her elevated blood pressure. Weight Watchers and Jenny Craig scored the best marks for effectiveness in a review of research on commercial diet programs, but many other plans just haven't been studied enough to evaluate long-term results.
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