Food supplements that claim to speed up weight loss are useless, believe experts.
A range including those based on fibre, cabbage and plant extracts are no better for slimmers than dummy pills, they say.
A Peninsula Medical School team from the universities of Exeter and Plymouth found no evidence herbal or nonherbal drugs work - while a German study got similar results.
The UK team reviewed existing data, including on guar gum, bitter orange, calcium, glucomannan (a dietary fibre), chitosan (listed as a fat absorber), chromium picolinate (sometimes sold as an appetite suppressant) and green tea.
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They told the International Conference on Obesity in Stockholm: "The findings fail to provide sufficient evidence that any food supplement can reduce body weight."
Meanwhile, the University of Gottingen's trial on nine over-the-counter weight loss supplements found no more weight loss than a placebo.
The British Heart Foundation said: "There's no quick fix. To lose weight we must use up more energy than we take in. The millions spent on dieting is often money down the drain."
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