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Having low levels of the bacteria Prevotella in the trial's participant's stools prevented them from losing weight regardless of whether they were consuming fruits and vegetables or heavy, rich food and sweets, the research adds.
Only around 50 per cent of people are thought to have sufficient Prevotella levels in their gut, the study found.
Study author Dr Zhaoping Li from the University of California, Los Angeles, said: 'For black tea lovers, there may be a new reason to keep drinking it.'Your stools reveal whether you can lose weight, research suggested last month.
People cannot shed the pounds without a specific bacteria in their faeces, even if they eat a healthy diet, a study found.
English breakfast tea may aid weight loss by boosting metabolism, but only if it is drunk without milk, new research reveals.