What are the indep variable and dep variable and what are the control and experimental group???

researchers divide 84 people into two groups both eating high fibber and low calorie diets. but one group consume 1500 milligram of hydroxycitric acid a day while the other group downed sugar pills. after 12 weeks there was no significant difference in either group.....both groups shed about 8 pounds. the hypothesis is that a natural remedy isnt always effective or something like that