Research
Adherence
Structured commercial weight loss programs produce significantly greater weight loss and BMI reduction than self-help methods over a 2-year period, though both groups experience significant weight regain after the first year.
If you are trying to lose weight, joining a structured program like Weight Watchers is more effective than trying to do it alone with self-help resources. You will lose more weight and keep it off better for at least two years. However, expect some weight regain after the first year regardless of the method, so consistency is key.
StrongSupportsHIGH confidence
The structured commercial weight loss program provided modest weight loss but more than self-help over a 2-year period.
Why this rating
Randomized clinical trial with high retention (73%) and intent-to-treat analysis.
Source
Weight loss with self-help compared with a structured commercial program: a randomized trial.
Stanley Heshka et al. · PubMed · 2003
DOI 10.1001/jama.289.14.1792
rct · n=423Cited 465×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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