A few quality studies have been carried out over the years, starting in 1998 with a double-blind, placebo-controlled trial of 135 adults over 12 weeks published in The Journal of the American Medical Association. They found no evidence that hydroxycitric acid, the active ingredient in weight loss products made from garcinia cambogia, produced significant weight loss.
The American Journal of Clinical Nutrition in 2004 published a systematic review of meta-analyses and clinical trials on dietary supplements for weight loss by complementary medicine researchers at the Universities of Exeter and Plymouth. None of the over-the-counter weight loss aids worked, including garcinia cambogia. Late in 2010 the peer-reviewed Journal of Obesity published a meta-analysis of studies testing the garcinia as a weight loss aid.
Causal research, also known as explanatory research is conducted in order to identify the extent and nature of cause-and-effect relationships. Causal research can be conducted in order to assess impacts of specific changes on existing norms, various processes etc.
A causal study must meet certain criteria. According to the University of Southern California’s Library Guide, a causal study contains “empirical association,” “appropriate time order” and “nonspuriousness.” Researchers must use empirical research methods to gather data, such as through observation and experimentation.
Causal research, also called explanatory research, is the investigation of (research into) cause-and-effect relationships. To determine causality, it is important to observe variation in the variable assumed to cause the change in the other variable(s), and then measure the changes in the other variable(s). Causal research should be looked at as experimental research. Remember, the goal of this research is to prove a cause and effect relationship. With this in mind, it becomes very important to have strictly planned parameters and objectives.
Definition of causal research: The investigation into an issue or topic that looks at the effect of one thing or variable on another. For example, causal research might be used in a business environment to quantify the effect that. A causal study’s hypothesis is directional -- it does not simply claim that two or more variables are related, but predicts that one variable or set of variables, called “independent variables,” will affect another variable or set of variables, .