Australian scientists are trying to answer this question. Green coffee beans have long been part of weight loss diets but now they say that used coffee grounds may also help. According to a study by the University of Southern Queensland, consuming coffee residue may control obesity. Rats were tested during a seven-year study. In laboratory tests, after eating used coffee for eight weeks, previously fattened rats had noticeable physiological changes: blood pressure returned to normal levels, blood glucose levels decreased, and liver function improved. Australian doctors expect the same results in humans. However, with no human trials yet, Professor Lindsay Brown, director of the experiment, is testing himself. First, he gained weight and now he is undergoing a used coffee diet to see what happens.