Diet programmes such as Weight Watchers, Slimming World and Rosemary Conley are cheaper and far more effective than those run by the NHS, according to new research.
Dieters lost more weight and kept it off for longer by joining a slimming club than after having counselling from specially trained staff in GP surgeries or pharmacies, it was found.
Experts said money would be better spent on encouraging people to attend classes run by commercial companies.
The study, published online in the British Medical Journal (BMJ), involved 740 obese or overweight men and women recruited from one NHS trust in Birmingham.
They were divided into six groups and attended either Weight Watchers, Slimming World, Rosemary Conley, a group-based NHS programme run by advisers and dieticians called Size Down, one-to-one counselling sessions in GP surgeries, or one-to-one counselling in pharmacies.
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