involving all kinds of foods based on this flood of doctor the scientists then have to ascertain which foods are healthy or unhealthy. results can vary greatly depending on the method used. interventions studies tend to produce better results but they're also more expensive here each participant receives exact instructions for what to eat the german institution of human nutrition has teamed up with billions cheri take clinic to carry out a study of this kind the scientists are investigating high fat mediterranean food adapted to german tastes they're comparing that with a low fat diet along the guidelines of the german nutrition society. one group is told to eat lots of fruits and vegetables and along with whole grain products a moderate amount of dairy produce really nice and fish. the other group is eating