To test the Hoodia, morbidly obese people from Leicester, England, were kept in a place as close to prison as it gets. All the volunteers could do was read papers and watch television and eat. Half the group was given Hoodia Gordonii and half was given a placebo. At the end of 15 days, the group on Hoodia had reduced their food intake by 1000 calories a day. Given the average daily diet is around 2200 calories, this was a remarkable success! Another clinical study performed in 18 overweight but healthy males provided statistical evidence that the Hoodia Gordonii extract reduced the average daily calorie intake and reduced body-fat over the 2 week clinical trial period.